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Author Topic: Vented Thermal store can I fit a gas combi?  (Read 396 times)
rsescorts
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« on: August 12, 2018, 11:01:36 PM »

I have a 350l thermal store, with wood burner and solar inputs.

These have been working well the 2 years we've had them. The TS runs the heating and UFH, with mains water going through the heat exchanger, gives lots of hot water
Just getting into a build With kitchen extension, I'd like to eliminate the delay in getting hot water all the way down to new kitchen.

I'm needing advice, Is there  a combi boiler to run the hot water in the extension and to also act as a top up for the TS if needs be.

The TS is 6m higher than the boiler intended position, this is showing 0.5 bar at the end of the pipe run.

Is there a combi that will work with this lower pressure?

Any advice or input will be appreciated

Cheers
Ken

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Philip R
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« Reply #1 on: August 13, 2018, 05:03:09 PM »

Ken,
From your comments about the .5 bar head pressure, I presume that you may want to heat the thermal store from the combi? And run the kitchen tap from the combi or thermal store?

There are combis that accept hot water input from solar heated stores,they have domestic water water inlets and controls designed for higher temperature operation.
Heating a thermal store, which is designed to permanently run above the temperature that a condensing gas boiler would condense is in my opinion in breach of eu  efficiency regulations and although not stated, in breach of boiler plus regs introduced in April this year.

When fitting a gas condensing combi, should have temperature (weather) compensation fitted, to comply with statutory boiler plus regs, so would not work heating thermal store.

By all means have a thermal store. But don't integrate a gas condensing boiler to it.
Use a gas condensing boiler at low temperature on ufh, but not via thermal store.

Philip R
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rsescorts
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« Reply #2 on: August 14, 2018, 08:05:14 AM »

Many thanks Philip, for the information.

I'm going have a rethink on this with the points you mentioned, as well as checking the newer regulations with the plumber.

I had wanted the boiler to be a back up to top up the TS if it was needed, I'll now connect the immersion heaters as the back up and use the new boiler to supply the UFH and the new radiators. This is what my plumber had originally wanted to do.

Cheers
Ken

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rsescorts
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« Reply #3 on: August 16, 2018, 10:49:42 AM »

Having checked these with the plumber, he has uprated the type of combi, it was going to be a boiler with only 90% efficiency, now going for a one that will reach the new regs and a smart setup..

cheers
Ken
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