Valiant 837..... my gas metre is racing

foxyuk

Cardew wrote: »

So that's about £4.

Your initial point was that the boiler was using more gas than its design capability.

The only way to check this is by having the Hot water taps running all the time you are checking the consumption on the meter.

It will then be on its maximum output, and hence maximum consumption. This is 4 cubic metres an hour - so 0.067 every minute.



Boilers/CH installations have a frost stat which is designed to do just that - it is normally set at about 4C.

will do this tommorow cardew ... taps on and turn heating on at same time... will post 1 to 5 mins readings...

did the readings earlier help in any way?

jalexa

foxyuk wrote: »

taps on and turn heating on at same time..

I think there is a misunderstanding there. There is only a single primary heat exchanger. The heat goes either to the heating circuit or is diverted to the DHW.

Cardew

foxyuk wrote: »

did the readings earlier help in any way?

Not really - other than to confirm it looks to be operating correctly.

In 5 mins the meter readings increased by 0.209. That rate is is 2.51 cubic metres an hour, which is 27.7kWh an hour which is exactly what you would expect for (flat out) heating initially.

It obviously won't consume gas at that rate all the time as the boiler will modulate(turn down the wick!)

foxyuk

jalexa wrote: »

I think there is a misunderstanding there. There is only a single primary heat exchanger. The heat goes either to the heating circuit or is diverted to the DHW.

ok thanks so the positing i made earlier with the hot water only reading then doing the heat on its on is my only test!!!! i will redo it again when the pipes have no heat in them tomorrow and see if any different

jalexa

foxyuk wrote: »

ok thanks

I think you can conclude that very probably the gas meter is accurate and the boiler is correctly set up to spec.

You may also have learned a lesson learned by many the hard way, a modern combi heating from cold can burn a pile of gas (who would ever have 28 one bar electric fires on at the same time?)

Cardew

I had missed the Hot water test, on which Jalex commented; mine referred to your heating test.

However from each test, it all looks in order. Do a further Hot water test for confirmation if you wish.

foxyuk

Cardew wrote: »

I had missed the Hot water test, on which Jalex commented; mine referred to your heating test.

However from each test, it all looks in order. Do a further Hot water test for confirmation if you wish.

will do tomorrow