Room sealed stove

Big Dec

Hi,

I am building a highly insulated, highly airtight house.
Just looking at options for room sealed stoves at the moment.
Entire heating system will be run via a 6kW ground source heat pump.

I don't have any external air intakes for the stoves (yet) but was looking at fitting a balanced flue inside my existing chimney (which are of standard construction).

From what I can tell, this limits me to gas stoves unless I decide to drill through the external walls. Floor insulation has not gone in yet, so I do have 150mm to play with.
Anyone with any experience in this area?

Stoves will be more for effect, as the heat pump with UFH & MHRV should provide for the space heating requirements. Stoves will be for effect more than anything else.

Cheers.

BryanF

Dec there are a few inconsistencies here. First of all, you are going with ufh you need the 150mm insulation zone.

Is the chimney/ stove location on an external wall?

Is the chimney thermally broken at ceiling/roof insulation level?

If this is as you say 'for effect', Would it be best to remove the chimneys and the cold bridge/air-tightness/cold air ingress issues and put in an electric fire?

Big Dec

Hi Bryan,

Sorry, I should have been a bit more specific in my original post.

I have ~225mm to play with in terms of my floor make up.
This will have at least 160mm insulation before the screed is laid, hence my statement about having 150mm to play with in terms of routing a pipe for an external air feed under the finished floor.

House has evolved as I have progressed & gained a better understanding of building techniques.
My architect & I are project managing & using direct labour where appropriate.
Chimneys are on internal walls & are of standard construction, so not thermally broken.
As an aside, I'd be interested in your thoughts on the thermally broken chimney but a quick PM is fine for that as opposed to side tracking the discussion here.
I hadn't thought of electric fires, but am just trying to future proof as much as possible for the future Mrs. :-)
I'd like the option of adding at least a gas stove (if not wood burning) down the line.

Dec.

BryanF

To late for the floor Imo

Curious Geroge

Also interested to know this. With no floor down yet, does a solid fuel stove need a air intake at the back of the fire ? and if so, does this air take need to be below ffl ? ie: does this hole need to be in place below I lay my insulation and screed ? Thanks

BryanF

Curious Geroge wrote: »

Also interested to know this. With no floor down yet, does a solid fuel stove need a air intake at the back of the fire ? and if so, does this air take need to be below ffl ? ie: does this hole need to be in place below I lay my insulation and screed ? Thanks

Yes. You need to consider the specs of thestove to size pipe, laid to fall , suitably weather terminated/vent

Curious Geroge

Curious Geroge wrote: »

Also interested to know this. With no floor down yet, does a solid fuel stove need a air intake at the back of the fire ? and if so, does this air take need to be below ffl ? ie: does this hole need to be in place below I lay my insulation and screed ? Thanks

Phoned a local company. If its a passive house then the external wall vent/hole is required but normal airtight houses with HRV would commonly go with a standard stove (enquired about a multi-fuel stove). If a hole is required, he said it did'nt need to be below ffl. Arguments for and against?

lownhard

Curious Geroge wrote: »

Phoned a local company. If its a passive house then the external wall vent/hole is required but normal airtight houses with HRV would commonly go with a standard stove (enquired about a multi-fuel stove). If a hole is required, he said it did'nt need to be below ffl. Arguments for and against?

"normal airtight house"...very ambiguous...does this mean 10 air change p/h as per the regs, or 1 air change p/h?

Could be the difference between passing out or staying alive when the stove is on!

Curious Geroge

lownhard wrote: »

"normal airtight house"...very ambiguous...does this mean 10 air change p/h as per the regs, or 1 air change p/h?

Could be the difference between passing out or staying alive when the stove is on!

so does the air intake for a stove need to be below ffl ?

lownhard

Curious Geroge wrote: »

so does the air intake for a stove need to be below ffl ?

Think BryanF said it already, it depends on the stove, where you are placing it etc. I would pick out the stove you want, look up the specs and see where the air intake it. If it is at the back, and you want your stove as flush to the external wall as possible (bearing in mind regs), then there is probably no need to have it below ffl. Below ffl would obviously create a neat job if the intake was on the bottom of the stove.