High gas usage for boiler.

[stevedurban]

Hi

Not sure if anyone can give any ideas - but
I’ve got a Worcester Bosch junior 24i system boiler.

For the past 10 years I’ve lived In the house - the average usage of gas has been about 10,000kwh. For the past 2 years my average has been 58000kwh. (Boiler is the only gas appliance in the house!)

It’s Regularly serviced. And from the 3 plumbers I’ve had look at it - they’ve all said - it’s just colder than normal so usage has gone up!

Anyone got any ideas? Is that an increase others are seeing?

SG

 

[Gasmk1]

You are either using it a lot more than before or there is a problem with the meter or you have a gas leak. How long is heating on for is it a combi or do you have a cylinder

 

[stevedurban]

Hi!

we’ve always had tado installed

It’s a system boiler with unvented cylinder

When we were away, I turned everything off - and gas usage was 0 - which I presume pretty much rules out a leak?

Is there any way to prove the gas meter theory?

Steve

 

[Gasmk1]

Hi!

we’ve always had tado installed

It’s a system boiler with unvented cylinder

When we were away, I turned everything off - and gas usage was 0 - which I presume pretty much rules out a leak?

Is there any way to prove the gas meter theory?

Steve

Other than having it tested, by gas supplier not sure

 

[stevedurban]

Has anyone ever actually seen a smart gas meter that’s caused higher usage that it actually should be?

 

[ShaunCorbs]

Yes also seen them when they don’t register how is the meter record (for billing) inputted eg do you do it online or does your supplier

 

[John.g]

Hi!

we’ve always had tado installed

It’s a system boiler with unvented cylinder

When we were away, I turned everything off - and gas usage was 0 - which I presume pretty much rules out a leak?

Is there any way to prove the gas meter theory?

Steve

580000kwh/annum = 159kwh/day, doesn't make any sense as this is the winter/summer average.
Can you see the units/decimal places on your meter, depending on what you find, if you can then get your boiler to fire flat out (24kw) for say 5 or even 2 minutes then will soon see if a meter problem.

 

[Ronald Jobe]

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.

 

[stevedurban]

The boiler is no longer under warranty sadly

We’ve had a number of gas safe engineers to check and service it - so I’d hope they would have confirmed the gas? Would that be part of a service?

What should I take pics of?

 

[John.g]

If the usage is actually ~ 10,000kwh/annum and not 58,000kwh/annum and if a boiler problem then it must be running at around 15% efficiency, (10/58*85%), scarcely believable?, the easiest/obvious first port of call IMO is to monitor the meter readings over a few minutes while running the boiler at its 24kw output.

 

[John.g]

The boiler is no longer under warranty sadly

We’ve had a number of gas safe engineers to check and service it - so I’d hope they would have confirmed the gas? Would that be part of a service?

What should I take pics of?

Can you (also) post a photo of your gas meter.

 

[stevedurban]

If the usage is actually ~ 10,000kwh/annum and not 58,000kwh/annum and if a boiler problem then it must be running at around 15% efficiency, (10/58*85%), scarcely believable?, the easiest/obvious first port of call IMO is to monitor the meter readings over a few minutes while running the boiler at its 24kw output.

It’s been about 58000/annum for the past 2 years!

I presume I put it in service mode to make sure it’s running full steam? And then monitor the gas meter for the time?

Thank you!

 

[John.g]

If service mode means that it opens all zone valves etc and then fires at 100%, then, yes, if not just turn up the room thermostats and the cylinder stats and ensure all zones calling for heat, then monitor gas usage for exactly two minutes or so, your meter must show decimal point measurement, if not it may have a flashing LED which may be used to monitor like our smart elect meters.

If a combi boiler just open all hot taps & showers.

 

[John.g]

You are looking at something like 0.074M3 usage over 2 minutes or pro rata.

 

[stevedurban]

Can you (also) post a photo of your gas meter.

 

[stevedurban]

If service mode means that it opens all zone valves etc and then fires at 100%, then, yes, if not just turn up the room thermostats and the cylinder stats and ensure all zones calling for heat, then monitor gas usage for exactly two minutes or so, your meter must show decimal point measurement, if not it may have a flashing LED which may be used to monitor like our smart elect meters.

If a combi boiler just open all hot taps & showers.

So I just did the test - put the boiler in service mode - turned the radiators all on (tado) and then watched the meter for 2 minutes exactly

The reading started at 4559.622 m3 and then went to 4559.672 m3 at the end of the 2 mins.

 

[ShaunCorbs]

I think you miss typed ? Either the first or last figure 3rd number in ?

 

[stevedurban]

I think you miss typed ? Either the first or last figure 3rd number in ?

Apologies - 4559.622 and 4559.672

That would have been even worse!!

 

[John.g]

That's a consumption of 0.050M3/2min, = 0.050*60/2, 1.5M3/hr, = 1.5*10.8, 16.2kwh = ~ 16.2*85%, 13.8kw boiler output.
That's probably OK as the boiler would not be firing full out to service rads only, So IMO, beyond any reasonable doubt, the meter is reading correctly.
Would suggest monitoring the meter reading over say exactly two full days and see what you consume, to convert..... Kwh = M3X10.8. To annualize it, Kwh = M3X10.8X365/2. (or divide by whatever the monitored period was).Depending on what you get then you must decide your course of action.

 

[ShaunCorbs]

Apologies - 4559.622 and 4559.672

That would have been even worse!!

Yes 12mw eg 12000kw 😀

 

[stevedurban]

That's a consumption of 0.050M3/2min, = 0.050*60/2, 1.5M3/hr, = 1.5*10.8, 16.2kwh = ~ 16.2*85%, 13.8kw boiler output.
That's probably OK as the boiler would not be firing full out to service rads only, So IMO, beyond any reasonable doubt, the meter is reading correctly.
Would suggest monitoring the meter reading over say exactly two full days and see what you consume, to convert..... Kwh = M3X10.8. To annualize it, Kwh = M3X10.8X365/2. (or divide by whatever the monitored period was).Depending on what you get then you must decide your course of action.

Thanks for the calculations! I’ll monitor for a few days then report back on the readings.

On the basis the readings are right - it would seem that the boiler must be firing most of the time to use that amount of gas? If so - what are the potential causes that it’s not getting the house to temperature quick enough?

The tado appears to be working - as I’ve stood by the boiler and amended the temperature and the boiler responded accordingly.

Could the pump not be sending the hot water round fast enough? A blockage? Faulty valve somewhere sending the hot water though?

 

[John.g]

Might have got up too early but where's the problem? both are the same, so 4559.672-4559.622 = 0.05M3/2min.
The reading started at 4559.622 m3 and then went to 4559.672 m3 at the end of the 2 mins. Post #16
Apologies - 4559.622 and 4559.672 Post#18

 

[stevedurban]

Might have got up too early but where's the problem? both are the same, so 4559.672-4559.622 = 0.05M3/2min.
The reading started at 4559.622 m3 and then went to 4559.672 m3 at the end of the 2 mins. Post #16
Apologies - 4559.622 and 4559.672 Post#18

I amended It in the original post to save confusion - seems it did the opposite! Sorry

 

[John.g]

Thanks for the calculations! I’ll monitor for a few days then report back on the readings.

On the basis the readings are right - it would seem that the boiler must be firing most of the time to use that amount of gas? If so - what are the potential causes that it’s not getting the house to temperature quick enough?

The tado appears to be working - as I’ve stood by the boiler and amended the temperature and the boiler responded accordingly.

Could the pump not be sending the hot water round fast enough? A blockage? Faulty valve somewhere sending the hot water though?

Can't say from that meter check reading what your "normal" daily consumption but once your house is up to temp then would expect something like say a boiler output of 3 to 5 kw to maintain that temperature, so maybe monitor it every hour or so as well, and post back.

 

[stevedurban]

Can't say from that meter check reading what your "normal" daily consumption but once your house is up to temp then would expect something like say a boiler output of 3 to 5 kw to maintain that temperature, so maybe monitor it every hour or so as well, and post back.

After 2 hours, the reading was 4562.288

So its used 2.616m3 in 2 hours