Isotherm Horizontal Water Heaters


Smart finish in a brushed stainless steel exterior, the quality of the Isotemp Basic by Isotherm, is not just skin deep. Optimal water heating is achieved in two ways, firstly by an immersed electric heating element (immersion heater) and secondly by utilising the boat's engine water heat (Heat Exchange).

Isotemp water heaters may be used with fresh water or salt water cooled engine systems. The immersion heater and heat exchanger are positioned in the lowest part of the tank, providing even thermo cycle heating of the water in the system.

The engine water heat exchanger coil is extra long for faster heating, especially handy on sailing yachts, which may run their engine for short periods only. The water inlets and outlets are positioned to minimise mixing of cold water into the hot, by the incoming water.

The immersion heater has been designed to enable easy removal to allow for inspection and cleaning of the tank. The materials used in the construction of the tank are of the highest quality. Acid resistant stainless steel AISI 316 is used for all parts of the tank that are in contact with water. The internal tank is insulated with expanded polyurethane insulation ensuring low temperature loss. The outer cover and mounting feet have been crafted from non-magnetic stainless steel AISI 304. The fixing feet are adjustable to 360 degrees, allowing the tank to be mounted horizontally or vertically.

An optional accessory to the range is the thermostatic mixing valve, see below, (controls the maximum temperature of water at the tap) which adds to safety, particularly important if having young children on board. The Isotemp range of water heaters by Isotherm have a two year full warranty and a five year limited warranty on the tank.

Max pressure: 6.0 bar
Power: 240V 750W


135696 Isotemp Slim Heater 25 Litre 780 x 295 11.0kg

135700 Isotemp Basic Heater 24 Litre 460 x 395 11.0kg

135702 Isotemp Basic Heater 40 Litre 630 x 395 17.0kg

135704 Isotemp Basic Heater- 50 Litre 750 x 395 20.0kg

135706 Isotemp Basic Heater- 75 Litre 1040 x 395 24.0kg

Control Valve:

A highly recommended option for all water heaters. Controls the maximum temperature of water at the tap or shower. Supplied complete with all components required to install to any Isotemp Basic  water heaters.  Please send us a message with details from the label onyour water heater.

Freight for heaters is quoted after the purchase as we need to determine the charges involved.  Generally $30-$100 East Coast.  A default freight fee is charged at time of payment.  You will be advised of any balance later prior to shipping.


SKU 341036