Hey thanks for the replies I have gotten your information has proven to be very helpful..
The next challenge that I have to over come is that both chimneys in this house are shot. One has major cracks in it and needs to be rebuilt and is not being used at the present time.
The other is in better shape cosmetically but i'm not so sure of that one yet either. I had someone out to look at it and give me a price to repair it and to get it in shape so that I could use it for a coal furnace. The cost of repairs make it impossible to consider doing a natural gas to coal conversion.
There is a liner in the one chimney already and is being used for the working Natural gas furnace that is in the house.. from what I can see and what I'm told it is the wrong type and size liner to run a coal furnace.
Now I know that people try not to recommend power vents for many reasons but I think that if I'm even going to go any further with this conversion idea I have to overcome this problem with the flue / chimney setup.
Can the EFM 520 boiler be set up to take an outside air kit??
also I have seen power vent kits that run on DC and have motor speed controls built into them and will work with long term battery backups.
My plan was to use a little of the technology that I used in a solar powered home that I built as far as the power vent having a constant source of power I have got that solved for up to 2 hours and if my back up generator doesn't start by then I have problems other than no heat.
I seen that Alaska Stoves makes a power venter kit has anyone seen any others out there
also yanchie you made mention that you own a coal gun boiler??
how do you like it and how much was it complete I'm considering a 260 coal gun or the EFM 520