Shopping from Canada? 
Go to Defender Canada!
Description
The Kuuma 20 Gallon Marine Water Heater 11870 delivers reliable hot water for life onboard with a corrosion-resistant aluminum tank and efficient 1500W heating. Designed for marine environments, it features ignition-protected controls, flexible side-mount installation, and ETL/CE certification for safety and performance.
Kuuma Marine Water Heater - 20 Gal - 11870 Item # 872413
Description
Kuuma Marine Water Heaters
Features:
- Available in 5, 6, 11, 20 and 26 gallon models
- Corrosion resistant, TIG-welded aluminum inner tanks
- Ignition protected controls
- Side-mount models with mounting tabs on sides of unit, front-mount units with mounting tabs front and rear
- ETL and CE certified
Specifications:
- Kuuma Model No. 11870
- Orientation: Vertical
- Mounting Arrangement: Side
- Heat Exchanger Position: Front
- Tank Capacity: 20 Gallons
- Tank Material: Aluminum
- Exterior Jacket: Aluminum
- Power: 120V AC / 1500W
- Circuit Breaker: 15 Amp
- PSI Rating: 100 PSI
- Dimensions: 18.875" W x 29.75" H x 20.75" D
Part Numbers for Kuuma Marine Water Heater - 20 Gal - 11870
Reviews
Questions
Do you know the spec. For how many gallons of Coolant are in the tank coil?
Hello Kuuma does not specify how much coolant the tank coil holds, Probably because the amount needed to be added also depends on the distance from the engine. The info below are snips from the manual.
7. Refill the engine coolant system with the manufacturer’s recommended coolant. For proper operations of both the engine and water heater all air must be bled from the coolant system. Failure to properly bleed air from engine coolant system could result in engine damage.
8. Check the system for leaks.
The tank and heat exchanger are aluminum. Do not use any chemicals in the heat exchanger that may cause damage to it.
Use only the engine manufacturer’s recommended coolant. DO NOT use raw water (salt water) in the heat exchanger circuit. Damage caused by a damaging chemical or a reaction due to salt water use is not covered under warranty.
Date published: 2025-02-11