ThermoMate Tankless Water Heater Electric 11kW - Instant Point-of-Use

In this review of the ThermoMate Tankless Water Heater Electric 11kW, the bottom line is simple: this is a compact, point-of-use unit best for small sinks, a single bathroom or an office break room that needs reliable, on-demand hot water without a bulky tank. The single biggest reason to buy is its combination of quick heat-up and a cast aluminum heating chamber design that aims to prevent scale on the element while delivering up to 2.15GPM at a 35F rise and a max temperature near 131F for steady, immediate hot water.

Key Features

• Instant Endless Hot Water: Provides on-demand hot water quickly for single or small multi-faucet use so users get warm water within seconds without tank standby losses.
• 11kW Heating Power: Delivers up to 2.15GPM at a 35F rise and supports up to three low-flow fixtures when sized for point-of-use applications.
• Leak Proof Construction: Uses a cast aluminum heating chamber and separates the heating element from water lines to reduce scale buildup and lower corrosion risk.
• Self-Modulating Efficiency: Automatically regulates power to match flow and inlet temperature, which improves heating efficiency and can reduce energy use versus a traditional tank.
• Space Saving Design: Wall-mount, side water connections and no tank make it easy to install in tight spaces like under a sink or in a small utility closet.
• Built-in Safety Protections: ETL certified with overheating protection and an auto-stop function when there is no water flow for added user safety.

Who It's For

This unit is aimed at homeowners, contractors or small business owners who need a compact, point-of-use electric water heater for a bathroom, small sink or office break room. It is particularly useful where rapid hot water is desired and floor space is limited.

Those who need whole-house capacity, very high flow rates for multiple showers at once, or who lack access to a 240V circuit with a 50A double-pole breaker and 6AWG wiring should look elsewhere for larger models or a gas-powered solution.

Pros & Cons

Pros

• Fast delivery of hot water with reported warm-up in about five seconds at point-of-use installations.
• Cast aluminum heating chamber and separated heating element reduce scale and extend component life.
• Self-modulating control increases heating efficiency and helps save energy compared to tank heaters.
• Compact wall-mounted design saves floor space and fits into tight installation locations.

Cons

• Limited flow capacity at 2.15GPM means it is intended for point-of-use or low-flow applications, not whole-house use.
• Requires a dedicated 240V circuit and a 50A double-pole breaker, which can add electrical installation cost if not already available.

Specifications

Brand	thermomate
Model Power	11 kW
Voltage	240 V
Max Flow Rate	2.15 GPM at 35F rise
Max Temperature	Up to 131F
Electrical Requirements	Requires 6AWG wire to 50A double-pole breaker (max draw ~46A)
Connections	1/2 NPT male ports, side water connection

Our Verdict

The ThermoMate 11kW electric tankless is a solid value for point-of-use hot water where space and energy efficiency matter; it heats quickly, resists scale with its cast aluminum chamber and fits tight installations. Buyers who need low-to-moderate flow for a sink or single bathroom and have proper 240V electrical capacity will find it a practical, cost-effective upgrade from a small tank heater.

Frequently Asked Questions

Can this unit supply more than one faucet?
Yes, it can support up to about three low-flow faucets or a single small bathroom fixture when matched to local inlet temperature and desired GPM.

What electrical circuit is required?
It requires a 240V circuit with 6AWG wiring and a 50A double-pole breaker; maximum amperage draw is about 46A.

How does it prevent scale on the heating element?
The heating element is separated from the water lines and the unit uses a cast aluminum heating chamber to reduce direct scale and corrosion on the element.