My indirect 75litre boiler I bought from
www.surejust.co.uk (marine specialist for making boilers for boats).
I draw water from my fixed mobile tank fitted in my van to my normal window cleaning pump which is only 75psi so as to avoid damaging my 'pressure relief valve)indirect boiler) which is then pumped to an 'accumulator tank (to prevent the pump from working overtime).
From my accumulator tank it is then pumped through the indirect boiler and then onto an expansion tank.
From the expansion tank I then have the choice of pumping it through to my hosereel for window cleaning or to pump it back into my secured tank fitted in the van.
The heat from the boiler is achieved by connecting radiator hoses from the indirect boiler to the radiator hoses that run in and out of the radiator from the van.
Because I have a twin coil boiler I can draw heat from 2 supplies. 1 is connected to my radiator. The 2nd one I intend connecting up to 2 water solar panels which I'll be fitting on the roof of my van during summer use! It is also possible to connect the boiler up to a diesel heater like the 'webasto' that I believe Ionics use or to an 'eberspacher' diesel heater.
The boiler also has a 2kw heater element fitted in the boiler which I can connect up to the electric if need be BUT I must ensure that the boiler is completely full before using the electric immersion appliance for safety reasons.
I read how to fit the boiler and all necessary connection on the internet under plumbing installations.
The 2 resons why I use an indirect boiler is because I do a lot of travelling because a lot of my work is right out in the rural countryside so I have plenty of chance to draw hot water from my radiator and also because the 650litre tank I use for window cleaning is so extremely well insulated with silver foil type bubblw wrap that my water will stay sufficently hot for at least 24 -36 hours. It's better insulated than any household storage tank. The insulation I use is called 'Thermawrap' and you can buy it from
www.thermawrap.co.uk or Tel.01909 721-662