adapting in-roof central heater to outside unit

[AndrewPatrol]

Does any one know if this is possible. our outside unit has had it and I have the chance to pick up a cheap in-roof model but not sure if its 1..weather resistant to put outside; 2.. is it capable of heating a slightly bigger house ( Is that BTU's - what is used to measure heat pumping capacity) 3.. could I put it outside with a shelter 4.. am I correct in assuming that an in-roof model may be rated smaller because it is centrally located whereas an outside model is located to one side of house and needs more power to pump to further extremeties. 5.. am I wasting my time due to some plainly obvious reason. Any knowledge accepted gratefully.

[tricky4000]

Indoor units won't work as well outisde in the cold. They're not as well insulated and also the electircal is not covered over like an external unit. You'll probably get a hell of a lot more creepy crawlies living inside the guts of it also...plus, they usually have a big ugly flu pipe sticking out of the top of it. I wouldn't bother. Will probably be too much mucking around to make it work right...you may as well look for a second hand external Brivis unit or something of the sort...if you want to save money.
Although...Brivis HE30 units are great. Very efficient and work extremely well.