High gas usage for boiler.

[John.g]

Heating was not on yesterday, wasn't on the ball there as I thought you went out at 9PM, so you used apparently 63Kwh on DHW, assuming mains at 6C, = 1,003 litres of water at 60C. The DHW heating was enabled from 11 to 1, 2 hours?? so the coil had to be inputting 31.5kwh/hr or a 31.5kw coil, no way. If you assume say 10kwh max was used for DHY heating then, 63-10, 53Kwh unaccounted for, if you take yesterdays usage, of 15.68M3, 178Kwh and subtract 53Kwh you end up with 125Kwh which then isn't outrageous or if no HW heating then consumption, 178-63, 115Kwh, normal enough for your sized house + DHW needs??.

IF no body pinching gas and IF no meter problems then it goes back to the boiler firing, you were averaging ~ 0.3M3/hr, 3.4kw which can easily be dissipated in the piping with all zone valves closed.
I thought you said you were going to run on the cylinder immersion for a few days with the heating coil didabled?. If/when you next go out then monitor the energy usage.

 

[stevedurban]

Heating was not on yesterday, wasn't on the ball there as I thought you went out at 9PM, so you used apparently 63Kwh on DHW, assuming mains at 6C, = 1,003 litres of water at 60C. The DHW heating was enabled from 11 to 1, 2 hours?? so the coil had to be inputting 31.5kwh/hr or a 31.5kw coil, no way. If you assume say 10kwh max was used for DHY heating then, 63-10, 53Kwh unaccounted for, if you take yesterdays usage, of 15.68M3, 178Kwh and subtract 53Kwh you end up with 125Kwh which then isn't outrageous of if no HW heating then consumption, 178-63, 115Kwh, normal enough for your sized house + DHW needs??.

IF no body pinching gas and IF no meter problems then it goes back to the boiler firing, you were averaging ~ 0.3M3/hr, 3.4kw which you easily be dissipated in the piping with all zone valves closed.
I thought you said you were going to run on the cylinder immersion for a few days with the heating coil didabled?. If/when you next go out then monitor the energy usage.

View attachment 72992

Correct me if I’m wrong - but yesterdays usage pretty much shows how much gas the boiler uses to fire up for the HW only (we can see that between 11-1) which looks like

.62m3 from 11-11.30
.34m3 from 11.30-12
.05m3 from 12-12.30
0 from 12.30 to 1 (I’m presuming the water was at temperature and didn’t need heating)

So on the basis that that usage above is right - I would say the only logical change that happens the rest of the day when we are in is that the room stat is calling for heat - which the boiler is trying to fulfil.

Either the house never gets to the temperature because
1) The house just can’t do it due to insualtion issues?
2) the boiler isnt getting hot enough water around? Pump issue? Temperature of the water?

 

[John.g]

Yes, didn,t realize heating was on earlier and the cylinder consumption of ~ 11.5kwh seems spot on to heat ~ 200 litres of water. So yesterdays CH consumption was ~ 178-11.5, 167Kwh, suppose seems a bit on the high side but you are heating a lot of house for long periods each day. You were averaging ~ 8 to 10 kw boiler output.

 

[stevedurban]

Yes, didn,t realize heating was on earlier and the cylinder consumption of ~ 11.5kwh seems spot on to heat ~ 200 litres of water. So yesterdays CH consumption was ~ 178-11.5, 167Kwh, suppose seems a bit on the high side but you are heating a lot of house for long periods each day. You were averaging ~ 8 to 10 kw boiler output.

Yes, didn,t realize heating was on earlier and the cylinder consumption of ~ 11.5kwh seems spot on to heat ~ 200 litres of water. So yesterdays CH consumption was ~ 178-11.5, 167Kwh, suppose seems a bit on the high side but you are heating a lot of house for long periods each day. You were averaging ~ 8 to 10 kw boiler output.

Ok - if that’s in the realms of possibility I guess I can accept that.

The only thing in the back of my mind is that my usage for 7 years was static with an average of 8-10000 a year - and now it’s 60000…. Just strange!

Apart from an Epc - are there any tests I can have that can pinpoint how to increase the thermal effficiency of the house?

 

[John.g]

Even if you averaged 160Kwh/day for the whole heating season of ~ 150days + 11Kwh/day DHW, 365 days/year, then your usage at say 28,000Kwh/year is a long long way from 60,000Kwh/year. although still way higher than your former usage of 10,000Kwh/year.
Don't know anything about increasing the thermal efficiency.

 

[Gasmk1]

Not going to read back but have you took into account that for two years our way of living has changed, eg first year of lockdown working from home heating used more. Not saying this is it but have you taken it into account

 

[Timmy D]

Just throwing this out there. What if the old meter was under reading and you have actually been using this amount of gas per year. New meter gets installed 2 years ago, reads correctly and now you notice it.

 

[stevedurban]

Just throwing this out there. What if the old meter was under reading and you have actually been using this amount of gas per year. New meter gets installed 2 years ago, reads correctly and now you notice it.

Very valid point! It could well be!!! And I’ve no real way to prove it now!

 

[Timmy D]

Very valid point! It could well be!!! And I’ve no real way to prove it now!

From reading the thread, everything pretty much checks out. Nothing posted stands out as odd for a property like yours. Perhaps if I saw the property it would, who knows.

From the basics, you check the gas line for tightness. No leaks confirmed. Good.

You check the boiler consumption/meter readings, yup it’s using the correct amount of gas. Good.

This means gas is only being used to generate heat via combustion.

This heat has to go somewhere.

No leaks on the cylinder wasting hot water. Good.

House not too warm. Good.

Not really anywhere else an increase of 5 times previous could come from.

 

[stevedurban]

From reading the thread, everything pretty much checks out. Nothing posted stands out as odd for a property like yours. Perhaps if I saw the property it would, who knows.

From the basics, you check the gas line for tightness. No leaks confirmed. Good.

You check the boiler consumption/meter readings, yup it’s using the correct amount of gas. Good.

This means gas is only being used to generate heat via combustion.

This heat has to go somewhere.

No leaks on the cylinder wasting hot water. Good.

House not too warm. Good.

Not really anywhere else an increase of 5 times previous could come from.

Your synopsis seems sound.

I’ve spoke to a thermal imaging and heat efficiency company who really new their stuff and pretty much said their same. They do thermal scans and air tightness test to see where the heat is escaping and advise on the remedial work we could look at - so I’m seriously considering it to at least get some closure!

 

[Timmy D]

Your synopsis seems sound.

I’ve spoke to a thermal imaging and heat efficiency company who really new their stuff and pretty much said their same. They do thermal scans and air tightness test to see where the heat is escaping and advise on the remedial work we could look at - so I’m seriously considering it to at least get some closure!

I agree.

This isn’t a dig, just my experience. Customers always talk about what can they do to save money on gas, can we upgrade to smart controls, upgrade the boiler etc.

Once you take into account the cost of these items, they really don’t save a huge amount. I’m not saying don’t do them, but they are not the golden gun.

A property takes a certain amount of heat energy to keep it at a certain temperature. Today’s high efficiency boilers running efficiency in the 90%+, don’t have a lot of room to improve.

With that and the age of our housing stock (subpar thermal insulation), the best efficiency increase is to stop that heat from escaping the property.

 

[hometech]

I think your Worcester bosch junior 24i system boiler is not getting the proper gas supply that's why your boiler not working properly. The heating output is 24Kw is ideal for any property with around 15 radiators.

Please share the pics so that I can help you more efficiently. If your boiler comes under the brand warranty then please contact customer care.

The second option will be you can take advice from the professional rooter and plumbing service provider near your area. Because the boiler system needs an engineer to fix it.

so please explain why a 24kw boiler is good for a number of rads?

 

[stevedurban]

I agree.

This isn’t a dig, just my experience. Customers always talk about what can they do to save money on gas, can we upgrade to smart controls, upgrade the boiler etc.

Once you take into account the cost of these items, they really don’t save a huge amount. I’m not saying don’t do them, but they are not the golden gun.

A property takes a certain amount of heat energy to keep it at a certain temperature. Today’s high efficiency boilers running efficiency in the 90%+, don’t have a lot of room to improve.

With that and the age of our housing stock (subpar thermal insulation), the best efficiency increase is to stop that heat from escaping the property.

No offence taken! I think your right and The survey will just be to put a final confirmation on it!

 

[hometech]

This is why you install a continous water heater and a separate heating boiler. Saves lost of money while providing perfect comfort levels...and they are really cheap to buy...with gas price trends being higher in the medium term, the ROI will be very short

 

[Desktop987456]

No offence taken! I think your right and The survey will just be to put a final confirmation on it!

@stevedurban: What was the conclusion of your high gas usage. Did you get the survey done for heatloss from the property?

 

[Lou]

(Just bumping a few older threads, they will drop off what is new soon)

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