[Jonny 87]

I reckon using the immersion that it's more expensive to run than a boiler?

Has anyone added up? Is it more electric cost than the £2 of propane per day I use?

[koopmaster]

I sound like a great idea if your in the north where its generally colder and can stay at minus for longer in the morning.

In south london we are a big more pampered with a higher temperature.  It only got to -2 overnight once this week and I just put the greenhouse heater in there that I have had for several years. 

next week is 6 or 8 degrees so back to normal temperatures.

[slap bash]

Its just to much of a PITA with gas in van insurance always being a problem is it safe is it insured or not extra cost for hoses and fittings. The risk of freezing. All three boiler froze and I am in the south. Worst it does not make more money. I like the idea but to much crap.