Mounting distance from wall?

[James Grizzard]

Can I close the normal gap of 12 inches if I use concrete board on the walls? Trying to find a good spot to mount a wood boiler and space is limited.

 

[GENECOP]

I would follow the manufacturers guidline. You can reduce clearances if you go Non Combustable...also " mount a wood boiler " is a little confusing..

 

[James Grizzard]

Sorry I'm trying to see if I can get it inside instead of burying line to a shed? Small house though 1100sq ft. Basement would be fun trying to lower a thousand pounds into.

 

[Pat32rf]

Don't know about your installation, but any time I've been involved with reducing clearances I have mounted the fireproof metal or cement board on fireproof standoffs so the air can circulate from the floor level, up behind the barrier, then escape into the room at the top.
Even concrete board will transmit heat thru to a stud wall behind it if it is nailed directly on the studs....