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Discuss Large Extension - Oil Boiler Advice + UFH in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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we are planing a large 11m x 11m 1.5 storey extension on the side of our house. We have no access to mains gas.

Our current setup is as follows: (installed in a new build 5 years ago)
4 Beds 3 Baths
worcester bosch combi boiler (located in car port/shed detached from house)
UFH downstairs - 5 zones
Rad’s upstairs - 8 in total

Extension:
2 beds 2 baths
110M2 of UFH (will require a new separate manifold from existing setup)
Wood burning stove

3-5 showers in use each morning during an hour slot.

Currently the combi boiler is inadequate for our needs. From the initial reading I’ve done people seem to be suggesting a system or regular boiler paired with a large unvented cylinder. (With possible solar panel paired to it).

I would welcome advice/suggestions on the above on what route is best to take.
 
The combi will be woeful.

What size is it. Could run the cylinder off of the combi.

Needs to be sized correctly, but may save needing a new boiler.
 
Indeed. From the day we moved in the combi boiler can’t handle the morning shower usage.

It’s a greenstar heatslave ext 18/25.
 
Sounds like a candidate for a professionally designed thermal store, consider UFH for the extension, easy to incorporate whilst it's being built.
 

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