Hi,
We have purchased a used van which has a Thermpure system already installed in it. Was concerned that the system dosn't have built in frost protection, unlike our Pure Freedom van which turns the diesel heater on at 2 degrees to keep things warm.
I know you can recirculate the hot water back to the tank but this seems an expensive option if it runs through the night burning a litre of diesel an hour.
What do other Thermopure users do?