central heating of woodburner

[russellsmiler]

To all
I am currently renovating a house.
The central heating system is to be from a gas combi (not mains), quite a simplistic layout 22mm Flow return with 15 mm drops to rads etc...However!!, I really want to install a woodburner and backboiler that will assist with the heating.!!

Does this sound feasible??

as part of flow return pipework from combi i also connect in the woodburner and have a seperate pump. so what i want to achieve is this.

1. can have central heating on by way of combi, with no woodburner lit!!
2. Can have central heating to house by way of lit woodburner with circulation by way of seperate pump

i dont want to use woodburner for hot water, as i have no storage area.
Unless i am wrong there cannot be much that is not ok with this scenario, however i am open to advice. Some of the questions in my own mind is.

1. when using the woodburner with seperate pump, will the circulation free flow past the pump in the combi.
2. Likewise when using combi boiler will the circulation free flow through the seperate pump.
3. Do i need a seperate pump...is it possible to turn the combi pump on without turning the combi heating on.
4. will i lose a lot of heat to the "cold" woodburner exchanger when using the combi for heating.
5. if so could this be gate valve managed(suspect it could but would need to closely managed)
6. Would any of this breach regulations.

Thanks for any advise

Russell

 

[simond]

You could link the two via a buffer/heatstore.

However, you have already suggested space is very limited.

Using gatevalves to isolate sections could be very dangerous. Many oil combis can be run opn vented making a Durnsley neutraliser feasible - but get manufacturer approval.

If you a going LPG, there are almost no combis that are suited to an open vented layout.

Probably more trouble than it worth. The best way to use log burner is as a simple efficient space heater, andvleave the room doors open. Heating water inside a log burner and taking it to a radiator is the same thing, but less efficient and riddled with issues, tar and heat dumping are just two of them.

 

[Bash_Bash]

Hi, I appreciate that this is an old post, but we are considering something similar, but have more space than Russel. This diagram does not include any woodburner help to assist with the hot water, simply to interface for central heating. We'd like a thermal store / buffer tank too, but I think that it is eye-wateringly complex unless we put it in the attic - where we don't really have space.
The yellow boxes are the heat sources (wood burner and pressurised gas boiler); green are the facilitators; pipes are colour coded; electrical connections are yellow (e.g. thermostat 1 to pump 1).

Will this work? Thanks in advance.