Roger I am so impressed with the unit I am going to be looking at going back onto tachograph and looking for another secondhand one, as a trailer unit, if possible, or contacting Mr Podell and having an import in the new year.
In two months, at the end of my year I will be upgrading the pump to an A&R pump, 35 litres per minute, with a return to tank fitted (to dump half of the water flow back to tank) so that when I require heat it will not be affected by flow rate and will give me the same output.
Ran it all day yesterday and with the engine exhaust now fitted to a new fabricated flue through the roof of the van it is very very clean. If I can fit some vents to the side of the van I could run it all day with all of the doors closed.
Rob