A bedroom with its own ensuite bathroom or vanity is often far from the main water heater, so you wait for hot water every morning. The fix is a small electric point-of-use tankless heater installed under the sink. It gives near-instant hot water for washing up and makes no noise. In bedrooms and attached baths, choose electric only; gas water heaters should not be installed in sleeping areas.
We compared power, voltage, flow and installation needs using manufacturer specifications and owner feedback. For scored reviews see tankless water heater for bedroom reviews; our Editorial Policy explains our process. Have an electrician add the dedicated circuit.
Top 3 Best Tankless Water Heaters for Bedroom Ensuites
Rheem RTEX-04T 3.5kW 120V Point-of-Use Tankless Water Heater
- 120V
- 30A circuit
- Thermostatic
Stiebel Eltron DHC-E 4/6-2 Trend Point-of-Use Tankless Water Heater
- Switchable power
- Display
- Low scale
CAMPLUX TE04N3 3.5kW 120V Point-of-Use Tankless Water Heater
- LED
- Self-modulating
- Compact
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Bedroom Ensuite Tankless Heaters Compared
| # | Product | Key Features | |
|---|---|---|---|
| 1 |  Rheem RTEX-04T 3.5kW 120V Point-of-Use Tankless Water Heater |
| Check Latest Price |
| 2 |  Stiebel Eltron DHC-E 4/6-2 Trend Point-of-Use Tankless Water Heater |
| Check Latest Price |
| 3 |  EcoSmart POU 4T 3.5kW 120V Point-of-Use Tankless Water Heater |
| Check Latest Price |
| 4 |  CAMPLUX TE04N3 3.5kW 120V Point-of-Use Tankless Water Heater |
| Check Latest Price |
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1. Rheem RTEX-04T 3.5kW 120V Point-of-Use Tankless Water Heater
Best Overall
- 3.5kW on 120V
- One 30A single-pole breaker, #10 AWG wire
- Thermostatic control
- Fits under a vanity
- Low flow, about 0.5 GPM rated
- Sink use, not a shower
- Power: 3.5kW, 120V
- Model: RTEX-04T
- Use: one sink
Rheem’s RTEX-04T is the simplest ensuite fix: one 120V circuit and a compact box under the sink.
It ends the wait for warm water at a far bathroom.
Who the Rheem RTEX-04T fits best
Bedroom ensuite sinks.
Who should skip the Rheem RTEX-04T
Showers.
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2. Stiebel Eltron DHC-E 4/6-2 Trend Point-of-Use Tankless Water Heater
Most Flexible
- Switchable kW output for more uses
- Backlit display with current temperature
- Direct coil system resists limescale
- Temperature 68–140°F by knob
- 240V circuit needed
- Single low-flow shower at most
- Power: up to 6kW, 240V
- Model: DHC-E 4/6-2 Trend
- Use: sink or low-flow shower
Stiebel’s DHC-E 4/6-2 can be set to more power where a 240V circuit is available, which can cover a low-flow shower.
Its coil self-cleans to resist scale.
Who the Stiebel Eltron DHC-E 4/6-2 fits best
Ensuites with 240V access.
Who should skip the Stiebel Eltron DHC-E 4/6-2
120V-only rooms.
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3. EcoSmart POU 4T 3.5kW 120V Point-of-Use Tankless Water Heater
Best Compact
- 3.5kW on 120V
- Thermostatic control
- 90% smaller than a tank (per maker)
- About 0.8 GPM
- Sink only
- Power: 3.5kW, 120V
- Model: POU 4T
- Flow: about 0.8 GPM
EcoSmart’s POU 4T is compact enough for a tight vanity cabinet.
It is ideal for washing hands and face.
Who the EcoSmart POU 4T fits best
Small vanities.
Who should skip the EcoSmart POU 4T
Bathtubs or showers.
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4. CAMPLUX TE04N3 3.5kW 120V Point-of-Use Tankless Water Heater
Best Display
- 3.5kW self-modulating on 120V
- LED display
- Water line separated from element
- CSA certified, overheat protection
- About 22°F rise at 1 GPM
- Best in warm climates
- Power: 3.5kW, 120V
- Model: TE04N3
- Use: one sink
CAMPLUX’s TE04N3 shows the temperature and adjusts power automatically.
In cold areas, its temperature rise is limited.
Who the CAMPLUX TE04N3 fits best
Warm-climate ensuites.
Who should skip the CAMPLUX TE04N3
Cold incoming water.
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Choosing a Tankless Heater for a Bedroom Ensuite
- Electric only: no gas appliances in sleeping areas.
- 120V vs 240V: 120V units are easier to add; 240V units give more heat.
- Sink vs shower: 3.5kW suits sinks; showers need much more power.
- Quiet operation: tankless POU units are silent.
Frequently Asked Questions
What is the best tankless water heater for a bedroom ensuite?
The Rheem RTEX-04T for its simple 120V install.
Can I use a gas tankless heater near a bedroom?
Gas units should not be installed in sleeping areas; follow local code.
Will a point-of-use heater run a shower?
Small 120V units cannot; higher-power 240V units may handle a low-flow shower.
Does it need a dedicated circuit?
Yes, have an electrician install one.
Final Verdict: Best Tankless Water Heater for Bedroom
The Rheem RTEX-04T is the best tankless water heater for a bedroom ensuite. The Stiebel Eltron DHC-E 4/6-2 is the most flexible, and the CAMPLUX TE04N3 has the best display.
Overall: Rheem RTEX-04T 3.5kW 120V Point-of-Use Tankless Water Heater Check Latest Price
Flexible: Stiebel Eltron DHC-E 4/6-2 Trend Point-of-Use Tankless Water Heater Check Latest Price
Display: CAMPLUX TE04N3 3.5kW 120V Point-of-Use Tankless Water Heater Check Latest Price
Instant warm water at your ensuite sink, with no waiting.
Looking for something else? Browse all of our Water Heaters guides and the wider Heating & Cooling section.
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