Hi thelimit, thanks for the feedback, that`s a good system you have there and I was considering that initially but there would be serious destruction and remedial works and expense to get pipe work from fireplace to hotpress (to all people building a house now allow for a backboiler during construction even if you don`t intend on using it you might in years to come) thats why I was looking @ the multi fuel boiler, there would be no internal work just probably a bit of breaking in the shed eg flue through wall, the problem is that I don`t know anybody that use them, I`m just concerned will they provide sufficient heat for the house