How do you measure a gas boilers efficiency

edited 9 March at 5:08PM in Energy
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MsttyMstty Forumite
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edited 9 March at 5:08PM in Energy
Hopefully a simple question how can you tell the efficiency of a boiler one that's been installed for 15 years?




Energy Provider Eon Next v18 2 year fixed ends April 2024 
Energy Used Electricity only. Hoping to get down to 6000 kWh a year. 2022 worked out at 6234 kWh a year in a 4/5 bedroom detached house EPC high B. Designed not retro-fitted ASHP Mitsubishi Ecodan, under floor heating ground floor, radiators 1st floor. Multi-fuel burner in lounge.

Dyslexia sufferer don't be too harsh if I get things a bit topsy turdy.

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  • Rodders53Rodders53 Forumite
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    You can go by the spec of the boiler when new from the handbooks, and expect it to be perhaps a little worse with wear and tear.

    To measure it will need lots of super expensive tech kit and likely the removal of the boiler to a suitable laboratory to do the measurements.
  • MsttyMstty Forumite
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    Sort of confirms searches so far.

    15 years just a little worse? 

    I do wonder how you can prove the efficiency in real life not on a test bench even when they are new let alone up for replacement or repair.
    Energy Provider Eon Next v18 2 year fixed ends April 2024 
    Energy Used Electricity only. Hoping to get down to 6000 kWh a year. 2022 worked out at 6234 kWh a year in a 4/5 bedroom detached house EPC high B. Designed not retro-fitted ASHP Mitsubishi Ecodan, under floor heating ground floor, radiators 1st floor. Multi-fuel burner in lounge.

    Dyslexia sufferer don't be too harsh if I get things a bit topsy turdy.
  • edited 9 March at 6:16PM
    BUFFBUFF Forumite
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    edited 9 March at 6:16PM
    Flue gas analyser I believe. Often a printout given as part of a service.
  • MsttyMstty Forumite
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    BUFF said:
    Flue gas analyser I believe. Often a printout given as part of a service.
    Yeah reading conflicting info they are mainly emissions detecting and not for efficiency.
    Energy Provider Eon Next v18 2 year fixed ends April 2024 
    Energy Used Electricity only. Hoping to get down to 6000 kWh a year. 2022 worked out at 6234 kWh a year in a 4/5 bedroom detached house EPC high B. Designed not retro-fitted ASHP Mitsubishi Ecodan, under floor heating ground floor, radiators 1st floor. Multi-fuel burner in lounge.

    Dyslexia sufferer don't be too harsh if I get things a bit topsy turdy.
  • edited 9 March at 6:34PM
    BUFFBUFF Forumite
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    edited 9 March at 6:34PM
    the results shoud be able to inform on combustion efficiency.
    Obviously from that you can't tell how efficient e.g. the heat exchanger is so there will be some losses.
  • markinmarkin Forumite
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    Measuring the gas use and the temp rise of a stone cold water tank should be very close.
     
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