Adding More Radiators

27 Jan 2008
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United Kingdom
We are about to move into a new home, and will be undertaking a project to create 2 new rooms, in what was formery a barn.

We are going to put a lot of time and expense into insulation, but I had a question about radiators.

The building is not attached to the main house. However, it is only detached by around 2m.

My preferd approach would be to extend flow and return into the building. It would be an easy job logistics wise as their is a radiator on the nearest outer wall of the house.

So I have two questions;

1. Would I be able to properly insulate the flow and return pipes, for a 2m outside run? I could dig below the frost-line, and obviously use Armaflex insulation (or similar). I could also run the pipes alongside a trace-heating kit, which switches on when the temp gets to 0.

2. In the out-building I'll probably add 3 or 4 large radiators. Is there a method by which I can check the capacity of the existing boiler, to establish if it's going to be able to cope with 4 new radiators and around10 meters of pipe. The boiler is a big-lad, but its also got a few miles on the clock, so might be an oppurtunity to upgrade it if need-be.

As the outbuilding actually houses the gas meter, an alternative approach would be to add a new small boiler puerly for the out-building. However, I woudl face the same challenge as above in getting water supply to it.

I have also debated underfloor electric, but ruled that out due to running costs.

Any suggestions/advice appreciated.
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