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Hot Water Heaters & Cookers

Motorhome cutaway


Webasto have a diesel powered DualTop compact unit which combines domestic hot water with interior cabin heating for motorhomes.  Wesbasto have the DualTop models RHA 101, 102 & 103 that produce heating power ranging from 0.2 kW – 9.2 kW depending on the model and they are all fuelled directly from the vehicle’s fuel tank.  The RHA 102 & 103 models feature digital control.

DualTop Hot Water HeaterThe DualTop hot water heater and interior heating unit can be installed underfloor thereby freeing up internal space within the motorhome.

Also for the motorhome market Eberspacher have produced a miniature diesel fuelled water heating system which can be installed underfloor or in the engine compartment.  The Hydron D4W System provides a heating system with an automatic sensing and temperature control for the vehicle interior and sufficient stored hot water for your domestic use.  Diesel fuel to operate the system is taken direct from the vehicle’s fuel tank.  The 10 litre hot water storage tank features a thermostatic mixer valve that automatically blends hot and cold water thereby increasing the amount of available hot water.


For heating the interior and hot water of a Class A motorhome or Luxury Coach there is the Oasis Modular Heating System which is an RV diesel ‘hydronic system’.   The system has two components, the first is the heating module which is available in two models CH35 & CH50 which have 35,000 BTU/ph and 50,000 BTU/.ph respectively.  See what is a BTU.  The Oasis Distribution Model is the second component and this comprises an engine interface heat exchanger, a domestic water heat exchanger with an anti-scald valve together with circulation pumps and a winter/summer solenoid.

International Thermal Research define their ‘hydronic system’ as ‘The circulation of hot water to provide heat is known as a “Hydronic” System. It is a closed system continually circulating the same coolant. It begins with a furnace or boiler, usually fuelled by diesel, or electric elements that heat the coolant to 180 degrees. A water pump circulates the hot coolant through a domestic water heater and then to the various fan units located throughout the interior of the motor home or yacht for example.  An engine coolant loop can also be added to preheat the engine or use the engine's wasted heat’.


Gas Free Cooking for Motorhomes

Webasto Diesel Cooker When not connected to mains power most motorhomes rely on LPG gas for cooking but now Webasto have introduced a Webasto Diesel Cooker X100 for gas free cooking.  For the heat source a diesel burner is integrated into the cooker which heats a Ceran ® glass top cooking surface suitable for two small saucepans.  The exhaust is vented to the outside of the motorhome.  The manufacturer states it has a low current and fuel consumption with high cooking power up to 1800 watts.

Diesel fuelled ceramic cooktops are also produced by Wallas mainly for marine application but some RV owners have adopted their use and installed them in motorhomes.  The fuel for these diesel operated cooktops can be taken from the motorhome’s diesel tank.

See also information on electrical and diesel heating here.



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