We have been doing some calculations about what kind of heating is required for a new 60x10ft widebeam.
Assuming 1" of sprayfoam on the walls and ceiling has a U value of 0.17, and taking into account 4.5 sq m of single glazed windows, for a living space of 13.45x3.05m, we came up with a value of 4.5kW required to heat the boat (which includes an extra 2kW for heating water).
If this is right, then a morso squirrel (with back boiler feeding radiators through the boat) would technically be enough to heat the boat, as the max output of a squirrel is 6kW.
The calculations are right to the best of our knowledge, although that is restricted to a copy of a double page spread of a book (without the accompanying explanations)!
As a comparison we calculated the requirement for our current boat, a 54' narrowboat with polystyrene and rockwool insulation, and it came to 5.7kW! (and we are fine with a squirrel.)
Does anyone have any thoughts on this? We'd be interested to know if other people have calculated similar values for their boats, and if anyone actually has a squirrel on a widebeam. Searching the web, it seems that most widebeams have bigger stoves - but we would rather stick with a stove we know if it will be sufficient. (We would ideally like a separate diesel stove at the other end as a backup / supplement, but that may come later.)
We've also had the madcap suggestion that underfloor heating could be a secondary/backup heating system (eg http://www.flexel.org.uk/ ) so thoughts on THAT would be interesting too!!
Thanks,
Michelle and Chris