John Carlyle-Clarke wrote:
Stewart Devereux wrote:

We have had numerous wood burners over the years, some with similar
problems to yours. First you must be aware they can generate ALOT of heat,
so metal might not be the best idea. I would go along with first reply.
1-2 inches loft insulation pinned to brick, then cut a piece of fireboard
to size and cover. Can easily be painted matt black. The burners work best
by allowing air to circulate around them-I don't think once you have it up
and burning you will be worried about reflecting heat back in !


Thanks for the reply, and to Andy too.

This one is a tiddler, and only 4kW. Nonetheless, I agree it should put out
a lot of heat.

One installer told me they could not put it in without enlarging the
aperture, because all the heat would get absorbed by the brickwork and none
would come out into the room.

And where does he think the heat will go when the brickwork has absorbed it?

I'd say that was a plus. My massive open fire chimneys and masonry
surrounds may take three hours to warm up, but they keep the temperature
up all night afterwards..and in summer, down all day too.

The aga flue heats the bedroom upstairs as ell.



Another installer (the one I want to use) said that was true, but he
proposed to use a 90 degree elbow from the back rather than the top, and
put the unit 3/4 way out of the hole, so only 1/4 of it is inside the
aperture.

Hmm.

That is really why I was thinking about the reflective qualities of the
backing, but I guess with a stove obscuring most of the opening,
re-radiated or reflected heat from the backing is not going to make much
difference.

Nope. Render it. All you really need is an air gap around it to allow
convection off it to come out to the room, A couple of inches is fine.

The actual stove temps are not that great. Couple of hundred C at the
most outside. OK too much for wood, and maybe plaster, but fine on
masonry and render.

Or as John says, use some fireproof board painted black. Thats quick and
simple. and will let less heat into the structure than render. But I
think render - with sharp sand and white cement - looks nicer.


4KW is a powerful fire. The UFH in my house is rated at 100w/sq meter.
Thats 3KW in a 6x5 sq meter room. I get a rate of rise of about 1 deg C
per hour with that..the open fires do about three times that once the
brickwork is warm.

I think you are going to love that stove.