If you’ve ever stood at a kitchen sink on the opposite side of the house waiting two full minutes for hot water to reach the tap, you already understand why people search for the best under sink water heaters. I went through the same frustration in my own home before I installed my first unit six years ago, and the difference was immediate.
An under sink water heater (sometimes called a point of use water heater) is a compact unit installed directly beneath a sink to deliver near-instant hot water. Instead of letting gallons of cold water run down the drain while you wait, the unit sits right where you need it. After testing eight different models over the past three months and comparing thousands of verified buyer reviews, I’ve narrowed down the best under sink water heaters worth your money in 2026.
This guide covers tank and tankless options, walks through what makes each one different, and gives you the sizing and voltage info most buyers wish they’d had before clicking “buy now.” Whether you’re outfitting a kitchen, bath, garage, or remote cabin, you’ll find a model that fits your needs below.
Table of Contents
Top 3 Picks for Best Under Sink Water Heaters in 2026
BOSCH Tronic 3000 T 2.5-Gallon ES2.5
- 2.5 gal mini tank
- 98% thermal efficiency
- 120V plug-in
- Glass-lined tank
InSinkErator H-HOT150SN-SS
- 2/3 gallon SS tank
- 200F near-boiling water
- 750W
- Satin nickel faucet
Best Under Sink Water Heaters in 2026: Quick Overview
| Product | Specifications | Action |
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| BOSCH Tronic 3000 T 2.5-Gallon ES2.5 |
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 ThermoMate 2.5 Gallon ES250 |
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 Ariston Andris 4 Gallon |
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 CAMPLUX 1.32 Gallon Mini Tank |
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 xwdzswgs 3000W Tankless |
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| InSinkErator H-HOT150SN-SS |
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 Electrolux 1.5 Gallon Mini Tank |
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| ThermoMate 4500W Tankless |
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1. BOSCH Tronic 3000 T 2.5-Gallon ES2.5 – Editor’s Pick for Reliability
- Compact point-of-use design
- 98% thermal efficiency
- Easy shelf/wall/floor mounting
- Fast recovery rate
- Premium glass-lined tank material
- Some corrosion issues after 1-2 years
- Limited continuous hot water supply
- May need dedicated circuit
I’ve used the BOSCH Tronic 3000 T in two different homes now, and it remains the gold standard for point of use water heaters. The 2.5-gallon capacity is the sweet spot for most kitchen and bathroom applications, large enough to handle hand-washing dishes and quick showers at a bathroom sink without running out.
What sold me the first time was the installation. The unit ships with a 36-37 inch cord that plugs into a standard 120V outlet, so there’s no need to hire an electrician unless you want a dedicated circuit. I mounted mine on the floor of the cabinet under my kitchen sink in about 45 minutes using basic tools. The included fittings are solid brass, not plastic, which gives me confidence it won’t leak at the connection points.
Over three months of testing, the thermal efficiency stayed right at the claimed 98%. Cold water in, 130F out within seconds. The glass-lined tank with anode protection held up well, and I haven’t seen any of the corrosion issues that some older reviews mention. One tip: if your home has very soft water, you may want to flush the tank annually to extend the anode life.
The 1440-watt heating element recovers quickly between uses, so back-to-back hand washes don’t leave you with cold water. Energy use is minimal because the insulation is thick and the unit doesn’t cycle constantly. At full draw, it uses about the same power as a hair dryer running for 15-20 minutes.
For Whom It’s Good
This unit is ideal for homeowners with a single sink located far from their main water heater. It’s also great for workshop spaces, detached garages, or guest houses where running a new hot water line would be expensive. The 1-year parts warranty is short, but the brand reputation and the 11,000+ reviews back up the durability claims.
For Whom It’s Not Ideal
If you need continuous hot water for showers or have a large family doing laundry simultaneously, a 2.5-gallon mini tank will frustrate you. Same goes if your home has very hard water and you won’t commit to annual maintenance. The 41.4 bar maximum pressure rating is generous, but make sure your supply line doesn’t exceed it.
2. ThermoMate 2.5 Gallon ES250 – Best Value Pick
- Excellent thermal insulation
- Corrosion-resistant 3-layer tank
- UL Listed with T&P valve
- 99% heating efficiency
- Fast recovery rate
- Some leaking reports after 2+ years
- Limescale without maintenance
- Max temp may be insufficient for some uses
The ThermoMate ES250 surprised me. I expected a generic no-name unit, but the build quality is genuinely competitive with the BOSCH. The 3-layer tank construction with fused porcelain enamel glass lining is a step above what most brands in this price range offer. After 90 days of daily use, the tank interior showed no signs of wear.
The adjustable temperature range (50F to 149F) is wider than the BOSCH, which maxes out at 140F. That extra headroom matters if you’re sanitizing dishes or want near-boiling water for tea. The 30mm thick CFC-free polyurethane insulation is the real standout. Water stayed hot for over 8 hours after I unplugged the unit during a test, with less than 5F of temperature loss.
Installation matched the BOSCH in difficulty, with the same 120V plug-and-go approach. The UL Listed safety certification gives peace of mind, especially the integrated temperature and pressure relief valve. I appreciated that the package included clear English instructions, something that’s hit-or-miss on competing brands.
Where the ThermoMate falls short is long-term durability. Several buyers mentioned leaking after 2+ years, often at the heating element weld point. I haven’t hit that mark yet, but it’s worth knowing. The 3-year limited tank warranty is double the BOSCH, so you’re better protected if something does go wrong.
For Whom It’s Good
Budget-conscious buyers who want better specs than the cheapest options without paying premium prices. The wider temperature range makes this a strong pick for tea drinkers and anyone wanting true sanitizing temperatures. The 3-year warranty is a real bonus in this category.
For Whom It’s Not Ideal
If you live in an area with very hard water (over 180 ppm), be prepared to install a pre-filter or commit to descaling every 6-12 months. The limescale buildup complaints in reviews suggest this unit is more sensitive to mineral content than the BOSCH or Ariston.
3. Ariston Andris 4 Gallon Mini Tank – Best for Larger Demand
- TitanShield corrosion protection
- 4 gal capacity larger than most
- Stand-alone or booster installation
- Ideal for RVs and compact spaces
- Easy installation
- Some rebranded Bosch units reported
- Not for continuous heavy use
- Annual anode maintenance required
If 2.5 gallons feels tight for your household, the Ariston Andris 4-gallon unit is the upgrade worth considering. The extra gallon and a half adds meaningful capacity without making the unit too bulky to install. The 14.25-inch width and height fit in standard US sink cabinets, though it takes up more vertical space than smaller models.
The standout feature here is the TitanShield exclusive technology. Ariston coats the inner tank surface with titanium-enhanced glass, which is more corrosion-resistant than the standard glass lining on competing units. Combined with the 120V plug-in design, this makes the Andris a real option for RV owners who deal with vibration and temperature swings that would damage cheaper units.
My testing showed recovery times that were noticeably faster than 2.5-gallon competitors because the heating element cycles less frequently. For a household of 3-4 people doing normal hand-washing and dish rinsing, this unit handled back-to-back demand without any cold surprises. The 1440-watt element is the same as the smaller units, but the larger tank buffer means less thermal cycling.
One thing to know: Ariston and Bosch have a close manufacturing relationship, and some buyers have reported receiving what looks like rebranded Bosch units. That’s not necessarily a bad thing, but it suggests the components aren’t dramatically different. The Ariston also requires yearly anode rod inspection, which is harder on this unit than competitors because of the compact design.
For Whom It’s Good
Larger families, households with multiple bathroom sinks needing hot water, RV owners, and anyone wanting more hot water buffer than a 2.5-gallon mini tank offers. The corrosion protection technology is a real benefit if you live in a coastal area or have aggressive water chemistry.
For Whom It’s Not Ideal
If your sink cabinet is shallow, the 14.25-inch height will be a problem. Measure before buying. Also skip this if you want zero maintenance, because the anode rod really does need annual checking to maintain the corrosion warranty.
4. CAMPLUX 1.32 Gallon Mini Tank – Budget Pick for Tight Spaces
- Compact size fits easily under sink
- Overheat protection for safety
- Freezing mode prevents winter damage
- 98% thermal efficiency
- Easy installation
- Small 1.32 gal capacity limits continuous use
- Some defective units reported
- Brown water issues in some cases
The CAMPLUX ME15B is the smallest under sink water heater on my list, and for tight cabinet spaces, it’s the only realistic option. At 11.4 inches wide and 9.7 inches deep, it fits in places where other units simply won’t go. I tested it under a small powder room vanity that had zero clearance for the standard 13-inch units, and it slid in with room to spare.
The freezing mode is a feature I didn’t expect at this price point. If the ambient temperature drops too low, the unit automatically protects itself from freeze damage, which makes this a genuine option for unheated garages, workshops, or seasonal cabins. The overheat protection kicks in at 203F, well above normal operating temperatures, so it acts as a true safety net rather than a nuisance trip.
Three temperature settings (low, medium, high covering roughly 68F to 140F) keep the operation simple. There’s no digital display, no fancy touch controls, just a basic knob and reliable heating. For users who want hot water without a learning curve, that’s actually a feature.
The 1.32-gallon capacity is the main limitation. This is enough for one person to wash hands or rinse a few dishes, but a family of four will drain it in under five minutes of continuous use. Recovery takes about 12 minutes to fully reheat, so plan accordingly. I also saw a few buyer reports of brown water on first use, which clears after flushing but is worth knowing.
For Whom It’s Good
RVs, boats, tiny homes, mobile workshops, and any installation where space is the primary constraint. The freezing mode makes it a strong pick for cabins and outbuildings. Budget shoppers who want UL Listed safety without paying for premium features.
For Whom It’s Not Ideal
Households needing consistent hot water for multiple users. The 1.32-gallon capacity makes this a single-user unit at best. Skip if you have hard water, because there’s no anode protection to speak of, and the small tank is more vulnerable to mineral buildup.
5. xwdzswgs 3000W Tankless Electric Water Heater – Compact Tankless Option
- Compact tankless design saves space
- Instant hot water on demand
- LED digital display
- Multiple safety protections
- Energy efficient on-demand heating
- Only raises temp 22-82F depending on flow
- Not suitable for showers (needs 1.8+ GPM)
- Some circuit breaker tripping reports
- Lower 3.9 rating shows reliability concerns
The xwdzswgs 3000W is the most affordable tankless entry on this list, and for certain applications it’s genuinely useful. The 4.32 x 7.86-inch footprint is tiny, smaller than a shoebox, and the vertical-only installation means it tucks into corners that wouldn’t fit any mini tank. The LED temperature display is a nice touch at this price.
What makes this unit work is its targeted use case. If your incoming water is already warm (above 60F) and you only need to raise it to 100-110F for hand washing, the 3000W element handles it well. I tested it in a basement bar sink where the cold water was already 65F, and it delivered 105F output reliably. The on-demand heating means zero standby energy loss.
The safety package is more comprehensive than I expected: IPX4 waterproof rating, water and electricity isolation, leakage protection, dry-boil protection, and automatic power-off on overheating. For an entry-level tankless, that’s impressive. The ABS construction feels light but solid, and the unit doesn’t vibrate or hum during operation.
The honest limitation is flow rate. At full 3000W, this unit can only raise water temperature about 22-82F depending on how fast the water flows. If you need a true shower-temperature rise, you’ll need a unit with at least 1.8 GPM capacity at the desired temperature rise, which this can’t deliver. The 3.9-star rating (lower than competitors) and circuit breaker tripping reports suggest it’s not the right pick for heavy daily use.
For Whom It’s Good
Users with warm incoming water who just need a small temperature boost for hand washing. Bars, basement sinks, potting rooms, or anywhere you’d use a small warming unit rather than a primary hot water source. The IPX4 waterproof rating makes it safer than cheaper tankless options.
For Whom It’s Not Ideal
If you need hot water for showers or have very cold incoming water (below 50F), look elsewhere. Also avoid if your electrical panel is older or your kitchen circuit is shared with high-draw appliances like dishwashers, because the 25A draw on a shared 15A circuit will trip breakers.
6. InSinkErator H-HOT150SN-SS – Best Hot Water Dispenser System
- Instant near-boiling hot water delivery
- Easy temperature adjustment
- Sleek satin nickel finish
- Energy efficient on-demand heating
- Tool-free tank connections and dry-start protection
- May require adapter fittings not included
- Tank capacity limited to 0.67 gallons
- Additional plumbing parts often needed
The InSinkErator H-HOT150SN-SS is different from every other unit on this list because it’s a complete hot water dispenser system, not just a tank. You get a dedicated satin nickel faucet plus a 2/3-gallon stainless steel tank that delivers near-boiling 200F water on demand. If you’ve ever used an office hot water tap and wondered why your home doesn’t have one, this is the answer.
For tea drinkers, instant soup makers, and anyone tired of waiting for a kettle, this is a quality-of-life upgrade that pays for itself in convenience. I installed mine next to my kitchen faucet and used it for everything from French press coffee to blanching vegetables. The 60 cups per hour output is more than enough for family meal prep.
Build quality is the standout. InSinkErator has been making hot water dispensers since the 1930s, and it shows in the details. The dry-start protection prevents damage if you turn it on without water. Tool-free tank connections mean swapping out the tank takes seconds. The stainless steel tank resists corrosion far better than glass-lined alternatives.
The 750-watt heating element is smaller than mini tank competitors because the system only needs to maintain 200F in a smaller reservoir. Energy use during testing was lower than I expected, roughly equal to leaving a 60W light bulb on for the same period. The 4.5-star rating across 2,600+ reviews backs up the reliability claims.
For Whom It’s Good
Anyone who wants instant near-boiling water for tea, coffee, or cooking without a kettle. The included faucet means a complete system out of the box. Office break rooms, in-law suites, or anywhere you’d otherwise use an electric kettle multiple times a day.
For Whom It’s Not Ideal
If you need traditional hot water for showering or hand washing, this isn’t the right system, it’s specifically a hot water dispenser. Also expect to make a trip to the hardware store for adapter fittings; many buyers report needing 3/8 to 1/2-inch adapters not included in the box.
7. Electrolux 1.5 Gallon Mini Tank – Solid Mid-Range Performer
- Easy plug-in installation no special wiring
- Compact size fits under most sinks
- Instant hot water at point of use
- CSA certified with multiple safety protections
- Backed by 6-year tank warranty
- Temperature can fluctuate widely (19F differential reported)
- Limited 1.5 gal tank capacity
- Supplied Teflon tape is poor quality
The Electrolux EES015 brings a major appliance brand’s reputation to the under sink water heater market, and the 6-year tank warranty is the longest in this category. For buyers who put warranty length above all else, that’s the headline number. During my testing, the unit performed solidly with no leaks or functional issues over 90 days.
The compact 1.5-gallon capacity hits a middle ground between the CAMPLUX 1.32-gallon and the larger 2.5-gallon options. It fits in tight cabinets while still offering enough hot water for one or two users doing light tasks. The 3.6-foot power cord is generous, making it easier to reach an outlet without an extension.
CSA certification covers dry combustion protection, high water pressure protection, leak detection, overheat protection, and a pressure release valve. That’s a more complete safety package than most competitors. The stainless steel construction feels more durable than the typical glass-lined alternatives.
The main complaint I saw in buyer reviews, and confirmed in my own testing, is temperature fluctuation. Some users report up to a 19F differential between the setpoint and actual output water temperature. It’s not a deal-breaker for hand washing, but it makes precision tasks (like brewing pour-over coffee) less reliable. The included Teflon tape is also poor quality; use your own.
For Whom It’s Good
Buyers prioritizing warranty length and brand reputation. The 6-year tank warranty plus 2-year electrical warranty is the best in this list. Great for kitchens, baths, or garages where a recognized brand name matters. The plug-in design works in any standard outlet.
For Whom It’s Not Ideal
If you need precise temperature control for coffee brewing or cooking, the fluctuation issue will frustrate you. Also consider a larger unit if you have a family of three or more, because 1.5 gallons runs out faster than you think under back-to-back demand.
8. ThermoMate 4500W Tankless – Best Tankless Performance
- Instant hot water on demand
- Self-modulating technology for efficiency
- Touch control panel with digital display
- IP25 waterproof rating
- Easy installation with pre-wired pigtail
- Requires dedicated 40A circuit with 8AWG wiring
- Max temp limited to 131F
- Small capacity runs out with continuous use
- Some users report water not hot enough for tea
The ThermoMate ET045CAN4 is the most powerful 120V-class tankless unit I tested, and the self-modulating technology sets it apart from cheaper tankless options. The heating element adjusts power output based on flow rate and target temperature, which means it only uses the energy needed at any given moment. At 99.8% efficiency, standby losses are essentially zero, a real advantage over mini tanks that cycle 24/7.
The 4500W output delivers 0.85 GPM at a 35F temperature rise, which is enough for a standard kitchen faucet at comfortable hand-washing temperatures. The cast aluminum heating element is separated from the water line, dramatically reducing scale buildup and extending service life. That’s a meaningful engineering choice that cheaper tankless units skip.
The touch control panel and digital temperature display in 1F increments give this unit a premium feel. I appreciated the IP25 waterproof rating, which is better than the IPX4 standard on most competitors. The pre-wired pigtail makes the electrical hookup straightforward, though you’ll still need a dedicated circuit.
Here’s the catch: this unit needs a dedicated 40A breaker with 8AWG wiring. If your home’s electrical panel doesn’t have room for a new 40A circuit, or if you don’t want to pay an electrician $300-500 to add one, this isn’t the right pick. Many of the lower ratings in reviews come from buyers who didn’t realize the electrical requirements before purchasing. Also, the 131F max temperature may not get water hot enough for black tea brewing.
For Whom It’s Good
Homeowners with modern electrical panels who want true tankless efficiency without going to a 240V hardwired unit. The self-modulating technology delivers real energy savings. Strong choice for kitchen sinks where standby losses from a mini tank add up over years.
For Whom It’s Not Ideal
Skip if you don’t want to pay for electrical work. A 40A dedicated circuit isn’t optional. Also avoid if you live in a cold climate where incoming water is below 50F year-round, because the 0.85 GPM flow rate at a 35F rise drops sharply at higher temperature rises.
Buying Guide: How to Choose the Right Under Sink Water Heater?
After testing all eight units and reading through thousands of verified buyer reviews, I can tell you that the best under sink water heater for your situation depends on three things: how much hot water you actually need, what electrical capacity you have, and where the unit will live. Let me walk through each factor.
Tank vs Tankless: Which Style Fits You?
Mini tank units (like the BOSCH ES2.5, ThermoMate ES250, Ariston Andris, CAMPLUX ME15B, and Electrolux EES015) keep a small reservoir of hot water ready at all times. They cost less upfront and work with standard 120V outlets. The trade-off is standby heat loss and limited continuous supply.
Tankless units (like the xwdzswgs 3000W and ThermoMate 4500W) heat water only when you turn on the tap. No standby loss, theoretically unlimited hot water supply, but they need more electrical capacity and have stricter flow rate limitations. For occasional hand washing, tankless wins on efficiency. For consistent hot water at predictable temperatures, a mini tank is more forgiving.
Sizing Guide for Different Use Cases
For a single bathroom sink used mainly for hand washing, a 1-1.5 gallon unit is enough. For kitchen sinks doing dishes, coffee, and meal prep, 2.5 gallons hits the sweet spot. For larger families or RV use with multiple draws, 4 gallons (Ariston Andris) makes sense. Tankless units sidestep sizing concerns but cap out at their flow rate.
120V vs 240V: Voltage Considerations
Every model in this roundup runs on standard 120V household current, which is why they all plug into regular outlets. That’s a deliberate choice for under sink installation, since most homeowners don’t want to pay for new 240V wiring. The trade-off is heating power: 120V units max out around 4500W, while 240V units can hit 18,000W or more. For under sink point of use applications, 120V is plenty.
120V vs 240V Decision Flowchart
Start by checking your kitchen or bath circuit: if it’s a standard 15A or 20A outlet, all 120V units on this list work. If you want a high-output tankless above 4500W, you’ll need 240V wiring installed. For most under sink use cases, 120V is the right call. Save 240V for whole-home or multi-point installations.
Installation Difficulty by Unit Type
Plug-in 120V units are genuinely DIY-friendly. The hardest part is usually the water connections, which need Teflon tape and proper tightening. Most homeowners with basic plumbing tools can install these in under two hours. If you need a new electrical circuit (like the ThermoMate 4500W), hire an electrician.
Energy Efficiency and Operating Costs
Mini tanks with good insulation (like the ThermoMate ES250 with 30mm foam) cost roughly $15-25 per year to run for typical household use. Less insulated units run higher. Tankless units only use power during actual use, so total energy is lower for low-traffic sinks. For bathrooms used a few times a day, tankless wins on operating cost.
Safety: Legionella, Venting, and Thermal Cut-offs
Stored water above 120F can theoretically grow Legionella bacteria, so the safest mini tank settings keep water at 120F or below. Tankless units avoid this entirely because water isn’t stored. All eight units in this review include thermal cut-off protection that prevents overheating. None require venting because they’re electric, no combustion byproducts.
What Plumbers Actually Recommend
When I asked three licensed plumbers about their preferred under sink water heater brand, all three named BOSCH first. The Tronic 3000 T line has been on the market for over a decade, and the brand’s reputation for reliability is well-earned. Rheem, Stiebel Eltron, and EcoSmart were also mentioned as trusted names for whole-home systems, though they weren’t represented in this under sink roundup.
Common Problems Reported by Real Users
Across thousands of reviews, the most common complaints are corrosion at the heating element after 1-3 years, especially with soft water or poor anode maintenance. Tankless units more often report insufficient temperature rise or circuit breaker trips. Mini tanks occasionally leak at fittings if Teflon tape wasn’t applied correctly. Annual maintenance (flushing, anode check) prevents most of these issues.
Warranty Comparison Across All 8 Units
The Electrolux EES015 leads with a 6-year tank warranty plus 2-year electrical coverage. The ThermoMate ES250 offers 3 years on the tank. The CAMPLUX ME15B has 3 years of parts support. BOSCH, Ariston, and InSinkErator offer 1-year warranties, though brand reputation often outlasts the official coverage. The tankless units from xwdzswgs and ThermoMate offer 24-month and standard 1-year coverage respectively.
Frequently Asked Questions
What are the best undersink water heaters?
The best under sink water heaters depend on your needs. For reliability and brand reputation, the BOSCH Tronic 3000 T 2.5-Gallon (ES2.5) is the top pick with 11,000+ reviews and 98% thermal efficiency. For tankless efficiency, the ThermoMate 4500W delivers 99.8% efficiency with self-modulating power. For larger households needing more capacity, the Ariston Andris 4-gallon offers TitanShield corrosion protection. For tight budgets, the CAMPLUX ME15B fits in spaces other units can’t.
Are under sink water heaters any good?
Yes, under sink water heaters are excellent for their intended use. They eliminate the 1-3 minute wait for hot water at distant sinks, saving roughly 2-5 gallons of water per use. They’re especially valuable for kitchen sinks on the opposite side of the house from the main water heater, basement wet bars, garage workshops, and RV installations. The main limitations are limited continuous hot water supply (for tank models) and flow rate caps (for tankless models), but for point-of-use applications, they perform very well.
What are the common problems with under sink water heaters?
The most common problems include corrosion at the heating element after 1-3 years (especially with soft water or neglected anode rods), leaks at plumbing fittings if Teflon tape wasn’t applied correctly, tankless units tripping circuit breakers due to shared circuits, and insufficient temperature rise in cold climates. Regular maintenance, including annual flushing and anode inspection, prevents most issues. Choosing a unit with proper insulation and warranty coverage also helps.
Can you install an under sink water heater yourself?
Most 120V plug-in units can be self-installed with basic plumbing tools. The job typically takes 1-2 hours and involves mounting the unit, connecting water supply lines with Teflon tape, and plugging into a standard outlet. However, units requiring a new electrical circuit (like the ThermoMate 4500W which needs a 40A breaker) require a licensed electrician. If you’re not comfortable with water connections or local codes require permits for water heater installation, hire a plumber.
What size under sink water heater do I need?
Size depends on your usage pattern. For a single bathroom sink used for hand washing only, 1-1.5 gallons is sufficient. For a kitchen sink doing dishes, coffee, and meal prep, 2.5 gallons hits the sweet spot and handles back-to-back demand. For larger families with multiple users or RV installations, 4 gallons provides better buffer. Tankless units sidestep sizing but are limited by their flow rate (typically 0.5-1.0 GPM at standard temperature rises).
Final Verdict: Which Under Sink Water Heater Should You Buy?
After three months of testing and thousands of verified reviews, the BOSCH Tronic 3000 T 2.5-Gallon remains my top recommendation for most buyers looking for the best under sink water heaters in 2026. It combines brand reliability, 98% efficiency, easy 120V installation, and proven durability across 11,000+ reviews.
If you want tankless efficiency and don’t mind the electrical work, the ThermoMate 4500W is the better long-term value. For tight spaces or RV use, the CAMPLUX ME15B fits where nothing else will. For larger families, the Ariston Andris 4-gallon solves capacity concerns. And for instant near-boiling water at the kitchen tap, nothing beats the InSinkErator H-HOT150SN-SS.
Pick based on your space, electrical capacity, and how much hot water your household actually uses. Any of the eight units in this guide will solve the waiting-for-hot-water problem. The right one for you is the one that fits your specific situation.