CRAFTSMAN 18kW 240V 3.7 GPM Tankless Water Heater - Compact Efficiency

Our review of the CRAFTSMAN 18kW 240-Volt 3.7 GPM Electric Tankless Water Heater finds it best suited for small households that need dependable on-demand hot water without gas hookups. The biggest reason to buy is its simple, space-saving design combined with precise digital temperature control, which delivers continuous hot water and can reduce energy use compared with a conventional tank. Installation requires a 240-Volt circuit and appropriate breakers and wiring, but once in place the unit reliably supplies warm to hot climates with enough flow for one to two bathrooms.

Key Features

• On-demand heating: Provides continuous hot water only when you need it, which can reduce standby energy loss compared with a storage tank.
• Digital control panel: Lets you set the temperature in 1 degree F increments from 90 to 122 degrees for precise comfort and consistent delivery.
• Compact 18kW power: Delivers up to 3.7 GPM at a 35 F rise, suitable for point-of-use or small whole-home installs in warm climates.
• Stainless internal components: Durable, non-corrosive, lead-free canisters and piping reduce maintenance and improve longevity.
• Electric operation: No gas line or ventilation required, so it fits installations where gas is not available or desired.

Who It's For

The CRAFTSMAN 18kW model is ideal for owners of small homes, condos, or apartments in warm to moderate climates who need a compact unit to serve one to two bathrooms or a single bathroom in cooler areas. It works well as a primary heater for a modest household or as a high-performance point-of-use unit for kitchens and baths.

It is not the right choice for larger homes with simultaneous heavy hot water demand or for users who cannot provide the required 240-Volt service with two 40 Amp double-pole breakers and two 8/2 AWG wires. Plumbers and electricians should evaluate home electrical capacity before purchase.

Pros & Cons

Pros

• Compact footprint and electric design eliminate the need for venting or gas lines.
• Precise digital temperature control allows degree-by-degree adjustment for comfort.
• Durable stainless and lead-free internal canisters promise long-term reliability.
• On-demand heating can lower energy use compared with tank heaters.

Cons

• Maximum flow is limited by 18kW output; performance drops in cold inlet conditions and may not support large simultaneous loads.
• Requires a dedicated 240-Volt circuit with two 40 Amp breakers and 8/2 AWG wiring, which can add installation cost.

Specifications

Model Power	18kW
Voltage	240 Volt
Max Flow Rate	3.7 GPM (35 F rise)
Flow at 45 F Rise	2.85 GPM
Flow at 55 F Rise	2.4 GPM
Temperature Range	90 to 122 degrees F (1 degree increments)
Plumbing Connections	Standard 1/2 in. NPT fittings

Our Verdict

The CRAFTSMAN 18kW electric tankless heater is a practical, space-saving choice for small homes or as a point-of-use solution where gas is not an option. It delivers consistent hot water with precise controls and durable components, offering good value for modest hot water demands if the home can accommodate the electrical requirements.

Frequently Asked Questions

How many bathrooms can this unit serve?
In warm to hot climates it can serve up to 1-2 bathrooms; in cool to cold climates it is best for a single bathroom due to reduced GPM at higher temperature rises.

What electrical service is needed?
It requires a 240-Volt service with two 40 Amp double-pole breakers and two 8/2 AWG wires; professional electrical installation is recommended.

Does it need venting or gas lines?
No, it is fully electric so no gas line or ventilation is required.