Two heat sources?

[Lotarogg]

Hi, on the internals of extension/gutting of small cottage and trying to find out whether it is possible to have two heat sources on one system - one would be a back boiler on a solid fuel stove the other proposed heat source being an oil fired boiler for convenience. Advice I have received so far has been conflicting, both in regard to system that switches between these two sources and for one that passes water through one then the next.

Basically is this possible and allowable within regs?

Cheers

 

[mysteryman]

It is possible.

You need to consider how much of the total heat input and frequency of use will be from the solid fuel. There are many compromises needed on a combined system to ensure safety when using solid fuel. These compromises can reduce the overall efficiency when running the oil fired boiler.

If the woodburner or solid fuel is only for very occasional use, it can be better to make that a dry roomheater appliance. You then make the controls on the oil fired side as effective as possible, making this as economical as possible.

However, if there is to be serious stoking and carrying of ash, by all means go for it. You will need some radiators plus the hot water cylinder on gravity. Some sort of thermal store cylinder may be best.

 

[supergas]

try these

http://www.h2panel.co.uk/h2index.htm

i installed one of these for the father inlaw, he has a trianco anthracite solid fuel boiler and i fitted a baxi solo heat only boiler this h2 panel makes them work together

works a treat

 

[supergas]

can also be applied to any heat sources
if your interested ring mike on 01354653854 hes very helpfull
he invented them and also installs them or just supplies them.
what he doesnt know isnt worth knowing.

 

[Lotarogg]

Thanks guys that's great and love the h2 system so will probably be getting in touch with him as we use the fire most nights in the winter and really would hate to waste the hot water it outputs.

Cheers

 

[DeltaT]

It is possible.

You need to consider how much of the total heat input and frequency of use will be from the solid fuel. There are many compromises needed on a combined system to ensure safety when using solid fuel. These compromises can reduce the overall efficiency when running the oil fired boiler.

If the woodburner or solid fuel is only for very occasional use, it can be better to make that a dry roomheater appliance. You then make the controls on the oil fired side as effective as possible, making this as economical as possible.

However, if there is to be serious stoking and carrying of ash, by all means go for it. You will need some radiators plus the hot water cylinder on gravity. Some sort of thermal store cylinder may be best.

I agree with MM.

The h2 system is very expensive, but it does work. Normal practice is to install a Dunsley neutralizer, a heatbank or thermal store for dual heat sources

Another thing that's commonly done; is just have a Domestic back boiler in your wood or solid fuel stove, heating water only. With a standard double feed indirect copper cylinder, connected up in the normal way, complete with cylinder thermostat.

 

[bengasman]

It is possible, but very expensive and quite dangerous if not done right. Certainly not something that lends to diy experiments.

This is not a subject to take any notice of deltat; he is a fraud posing as an expert.

 

[Norcon]

You could try nrv's, and twin coil cylinder.
Page 18 shows a simple interlink system.
http://tiny.cc/utn2g