Compact Tankless Water Heaters · Best Compact Tankless Water Heaters for Condensing
10 Best Compact Tankless Water Heaters for Condensing (2026)
We evaluated every model against our criteria. 10 earned a spot. Here's what each is best for — and when a different option wins.
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Top 3 at a glance
Top 3 at a glance
1
Best OverallCAMPLUX ENJOY OUTDOOR LIFE
CAMPLUX Electric 6kW
Best for: electric with indoor
100% match
Check today’s price →Why this pick
Condensing models capture and reuse heat from exhaust gases, making them more energy-efficient. The CAMPLUX ENJOY OUTDOOR LIFE Tankless Water leads because it delivers electric with indoor — exactly what this ranking prioritizes. A touch control panel provides temperature adjustments and status display.
2
Runner-UpEccotemp
Eccotemp Smart Home Indoor 4.0 GPM Natural Gas Tankless Water Heater
Best for: electric with indoor
100% match
Check today’s price →Why this pick
The Eccotemp Smart Home offers electric with indoor. Eccotemp’s FVI12‑NG is a compact natural gas tankless heater providing 3.6 gallons per minute.
3
Also GreatFOGATTI
FOGATTI 66,000 BTU (Highest Output), 0.5-3
Best for: electric with indoor
100% match
Check today’s price →Why this pick
The FOGATTI InstaShower Ultra offers electric with indoor. Its moderate price and straightforward installation make it a compelling upgrade for mobile living..
55,000 BTU output
4
#4 PickNOVIEEX
Tankless to 4.3 GPM, 100000
Best for: electric with indoor
100% match
Check today’s price →Why this pick
The NOVIEEX Water Heater, delivers electric and indoor. It ignites with two D‑cell batteries and requires no electrical connection.
Why this pick
The Bosch Tronic 3000C differentiates with non-condensing (condensing models are more efficient but may have higher upfront costs). Its 3‑inch depth and minimalist design allow it to be hidden under cabinets.
Why this pick
The EcoSmart ECO 11 differentiates with non-condensing (condensing models are more efficient but may have higher upfront costs).
Why this pick
The Eemax EEM24013 Electric differentiates with non-condensing (condensing models are more efficient but may have higher upfront costs). This Eemax model provides 3 gallons per minute, making it ideal for individual showers or sinks.
Why this pick
The Rheem 18kW 240V differentiates with non-condensing (condensing models are more efficient but may have higher upfront costs). A digital thermostat allows exact temperature adjustment, and self‑modulating elements optimize power draw.
Why this pick
The Stiebel Eltron DHC‑E differentiates with non-condensing (condensing models are more efficient but may have higher upfront costs). Weighing only five pounds, this point‑of‑use unit can be installed under a sink or in a closet.
Why this pick
The Eccotemp i12‑LP Indoor differentiates with propane (choose the energy source that best suits your installation and energy efficiency needs). It features a sleek black tempered glass front panel and touch controls for temperature adjustments.
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