Solid fuel back boiler

letsgogreen · 16 Jan 2010

Hi, I am hoping to fit a back boiler to my log burning Villager stove. I'm after any advice regarding the design of the rest of the system.

I am connecting it to a thermal heat store which in turn links to an airconditioning system and the domestic hot water.

The sort of things I would like to know are:

If the boiler is 10,000 BTU, 3Kw, what size radiator should be fitted as a heat dump?

The radiator/heat dump would work on convection but I think I will struggle to get the link to the heat store to do this. Does that matter?

Thanks in advance.

Goldspoon · 17 Jan 2010

letsgogreen said:
If the boiler is 10,000 BTU, 3Kw, what size radiator should be fitted as a heat dump?

I have struggled to find a definitive answer to this and I have searched on Google a number of times. I have completed the Hetas three day course and although a heat sink rad was mentioned the size was not. I remember reading somewhere that 20% would do (unconfirmed) therefore you would need 0.6kw rad.

letsgogreen said:
The radiator/heat dump would work on convection but I think I will struggle to get the link to the heat store to do this. Does that matter?

Ideally the store IS the heat sink (gravity). If the rad is the heat sink then you can pump a circuit (to the store) from this primary circuit.

Nige F · 17 Jan 2010

If you want a rad as a heat sink on gravity. You will need 3/4 tappings

Norcon · 17 Jan 2010

Nige F said:
If you want a rad as a heat sink on gravity. You will need 3/4 tappings

Mine had normal tappings and it worked fine as a heat sink.

Goldspoon · 17 Jan 2010

20% mentioned in this thread. Also discussion on using 2 or 4 tappings.

http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4642

Terrywookfit · 17 Jan 2010

Nige F said:
If you want a rad as a heat sink on gravity. You will need 3/4 tappings

I have seen and fitted hundreds of heat leak rads over the years.
Not a single one has been 3/4".
The boiler instuctions are the best guide for sizing, C Y A.
Some recommend the first floor circuit to be gravity.(Grant Triple Pass) was one.
Others only require enough to dissipate the heat when slumbering.

letsgogreen · 20 Jan 2010

Thanks for all the advice folks. It's been very useful. I feel much better informed, ta.

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Solid fuel back boiler

letsgogreen

Goldspoon

Nige F

Norcon

Goldspoon

Terrywookfit

letsgogreen

DIYnot Local

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