The heat requirement is about 13KW but I have an 18KW Installed.
last year 18kW was the smallest.( now 8/10/12/18/24/32)
We burn approximatly 1/2 bag of logs and a bale of briquetts for about 14 hours burning or 1 euro palet
Yes you can burn coal the problem is when the fan cuts off its inclined to soot up the stove, its best to burn logs turf , heatlogs.
No I havent a battery back up but you can get one no problem.
When you loose power the fan shuts down and the stoves starts to cool after about 45 mins as you have no draught.
There is an open vented water shell around the stove and the pressurised side has a 3 bar safety valve as any system would. even if the stove on the open side boils for any reason the pressurised side is still working taking the heat away and with no cavitation very important.
Yes the stove is fully pumped to a 300l cylinder with solar also.
Best regards
Gregor