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Coolant connections
All water heating components must be installed in safe locations, where they do not cause any scalding or damage to
people, animals, or surrounding materials due to excessive heat. Especially metal joints can get as hot as the coolant
(max +85 °C) and can cause damage if they are positioned too close to less heat-resistant materials.
Before doing any installation or service work for the heater or water system, shut down the heater and let the system
cool down to prevent possible injury or burns.
When choosing the installation location, it should be noted that in the event of a possible leak, the
leaking water will not enter the boat/vehicle/building structures.
There must be an overflow basin or an outlet pipe in the installation space of the device.
Spring clamp must be used in every hose barb connection.
Make sure that the flow direction is correct in your installation.
Route all the coolant hoses so that they are rising from the lowest point to higher. This will prevent air locks from the
system.
Follow the hose manufacturer's bending radius recommendations to prevent clogging or kinking.
Make sure that the coolant hoses are far enough from the hot places such as engine/stoves/heaters/fireplaces.
Coolant ducting and fuel hoses must be protected in locations where they are susceptible to mechanical damage due to
sharp edges, chafing or heat.
Double check all the hose clamps and joints to prevent any leakages.
Make sure that the temperature difference between the inlet and outlet of the coolant is approximately 10 Celsius. This
ensures that the water flow through the whole system is sufficient.
The heater is designed to be used with the open header tank. The system should not be pressurized. The maximum
pressure of the system 0,5 bar.
To prevent corrosion and freezing, the system has to contain enough antifreeze/coolant liquid following the coolant
manufacturer's recommendations.
Before first start up, or after liquid change, it is important to bleed the coolant system of air. If the system is not free of
air, the system will not work as designed.
When choosing the size of a header tank make sure that volume of the tank is large enough. In coolant systems using
19 mm hose, for every 10 m of hose, a 64 °C temperature change will change coolant volume by 4 cl. In coolant
systems using 21 mm hose, for every 10 m of hose, a 64 °C temperature change will change coolant volume by 5 cl.
Maximum height difference for Wallas (7116) 5W circulation pump is 1,4 m and it will pump max 8.5 l/min.
Maximum height difference for Wallas (7117) 15W circulation pump is 3,2 m and it will pump max 12,6 l/min.
Water pump installation
The water pump must be installed
horizontally.
When tightening the connector, use two 21 mm
wrench, ViceGrip® or equivalent to tighten the
joint.
Arrow printed to the side of the
pump indicates the flow direction.
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