Slim & Basic Waterheaters - Isotherm
Isotemp Isotemp
  • Slim & Basic Waterheaters - Isotherm

Isotemp Slim & Basic Water Heaters

The Isotemp Slim or Basic Water Heater from Isotherm is ideal for use aboard yachts and boats. It is constructed of high quality components including a stainless steel water tank and external cylinder, and it can be mounted both horizontally and vertically.

This immersion heating element is designed to heat the water in the lowest part of the tank. It features a mixing valve and expanded foam polyurethane insulation for the lowest amount of temperature loss. The engine water heat exchanging coil is extra long for faster heating, and is especially beneficial for sailing yachts.

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Tech Spec Product Info User Generated Content


  • Max Pressure: 87 psi
  • Immersion Heater: 115V / 750W


  Volume  Dimensions (in)  Weight 
Slim 15  4 Gal  21.25" x 11.38"  23 lbs 
Slim 20  5.3 Gal  26.19" x 11.38"  25.3 lbs 
Slim 25  6.5 Gal  30.88" x 11.38"  30 lbs 
Basic 24  6.4 Gal  19.31" x 15.56"  30.8 lbs 
BRAND: Isotemp
Type: Water Heater
5 1


by PowerReviews
Isotemp Slim & Basic Water Heaters

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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(3 of 3 customers found this review helpful)


Sleek design, easy to install

By Agadda Da Vida

from Anacortes, WA

About Me Handyman

Verified Reviewer


  • Energy Efficient
  • Long-Lasting
  • Works Quickly


    Best Uses

    • Marine

    Comments about Isotemp Slim & Basic Water Heaters:

    I purchased this heater for a 32' sailboat. The slim design and integrated unit made installation a breeze, even in tight "locker space" quarters. I wired it through an auto-switching inverter and on/off switch w/light to be able to monitor status as well as have flexibility of use. It works perfectly on shore power or inverter power (make sure you have ample house batteries) so I don't need to run the engine after every use. I can also switch it off when the engine is running so I'm not using the inverter. Love the low power demand.

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