An easy-setup tankless water heater has no venting, no gas line and standard plumbing connections, which is why electric models are the simplest to install. These three use common 3/4-inch or standard fittings and simple two-wire hookups, so a licensed plumber and electrician can finish the job quickly. “Easy” still means following the manual and local code.
We compared fittings, wiring needs, included parts and controls using manufacturer specifications and owner feedback. For renters see the best tankless water heater renter friendly guide, or start with the best tankless water heater; our Editorial Policy explains how we choose. Electric tankless heaters must be wired to code; have a licensed electrician confirm your panel, breaker and wire size before you buy.
Top 3 Easiest Tankless Water Heaters to Install
TOTTE 18kW 240V Electric Tankless Water Heater with Installation Kit
- Install kit
- 3/4″ NPT
- 18kW
SIVUATEK V7B-140B 14kW 240V Electric Tankless Water Heater
- 14kW
- Standard fittings
- Touch panel
EcoSmart ECO 11 13kW 240V Electric Tankless Water Heater
- 13kW
- Self-modulating
- Compact
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Easy-Setup Tankless Water Heaters Compared
| # | Product | Key Features | |
|---|---|---|---|
| 1 |  TOTTE 18kW 240V Electric Tankless Water Heater with Installation Kit |
| Check Latest Price |
| 2 |  SIVUATEK V7B-140B 14kW 240V Electric Tankless Water Heater |
| Check Latest Price |
| 3 |  EcoSmart ECO 11 13kW 240V Electric Tankless Water Heater |
| Check Latest Price |
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1. TOTTE 18kW 240V Electric Tankless Water Heater with Installation Kit
Best Overall
- Comes with an installation kit and manual
- Standard 3/4″ NPT water connections
- Simple 2-wire hookup
- Self-modulating 18kW, 1–2 uses at once
- Needs 2 x 40A breakers
- Newer brand
- Power: 18kW, 240V
- Connections: 3/4″ NPT
- Model: KF640007US-01AK-001
TOTTE ships the parts most installs need, which cuts trips to the store.
It can run a shower and a sink together.
Who the TOTTE 18kW fits best
Small homes replacing an electric tank.
Who should skip the TOTTE 18kW
Homes without panel capacity.
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2. SIVUATEK V7B-140B 14kW 240V Electric Tankless Water Heater
Best Mid-Size
- Standard pipe fittings
- Touch sensor control and display
- 14kW, up to 2.3 GPM
- Overheat protection
- Point-of-use sized
- Newer brand
- Power: 14kW, 240V
- Flow: up to 2.3 GPM
- Model: V7B-140B
SIVUATEK’s V7B-140B is meant to mount a few feet from a shower or washer.
Its touch panel keeps setup simple.
Who the SIVUATEK 14kW fits best
One bathroom or laundry.
Who should skip the SIVUATEK 14kW
Whole-home use.
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3. EcoSmart ECO 11 13kW 240V Electric Tankless Water Heater
Best for Warm Climates
- 13kW at 240V
- Patented self-modulating technology
- Compact wall mount
- Small footprint for tight walls
- Configured for 60°F inlet climates
- Limited flow in cold areas
- Power: 13kW, 240V
- Climate: 60°F inlet water
- Model: ECO 11
EcoSmart’s ECO 11 is a compact unit for warm-climate homes.
Its small size makes wall mounting easy.
Who the EcoSmart ECO 11 fits best
Southern homes.
Who should skip the EcoSmart ECO 11
Cold climates.
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Before You Install
- Check breaker and wire requirements in the manual.
- Confirm the water connection size.
- Plan a shutoff valve on each side of the heater.
- Use a licensed electrician and plumber where required.
Frequently Asked Questions
What is the easiest tankless water heater to install?
Electric units like the TOTTE 18kW with an included install kit.
Can I install a tankless heater myself?
Many areas require licensed trades; check local code.
Do electric tankless heaters need venting?
No.
What breakers do I need?
It depends on wattage; see each manual.
Final Verdict: Best Tankless Water Heater Easy Setup
The TOTTE 18kW is the easiest tankless water heater to set up thanks to its included kit. The SIVUATEK 14kW is the best mid-size pick, and the EcoSmart ECO 11 suits warm climates.
Best overall: TOTTE 18kW 240V Electric Tankless Water Heater with Installation Kit Check Latest Price
Mid-size: SIVUATEK V7B-140B 14kW 240V Electric Tankless Water Heater Check Latest Price
Warm climates: EcoSmart ECO 11 13kW 240V Electric Tankless Water Heater Check Latest Price
Simple fittings and clear wiring make for a faster install.
Looking for something else? Browse all of our Water Heaters guides and the wider Heating & Cooling section.
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