Potterton Myson Midas BF old combi natural gas boiler. At start up it uses
gas at the rate of 90cuft per hour then drops back to 60cuft per hour.
Over 1 hour it uses 70cuft. If my maths is correct 90cuft equates to about
28Kw.
From the sedbuk site the spec for this boiler states "Power: modulating
20.5 - 20.5 Kw" Is the gas rate on the boiler set too high (I don't have
the service manual for this boiler, so don't know what the rate should be)?
Any help for my sister-in-laws huge gas bill appreciated!
Gary

"gary" wrote in message
...
Potterton Myson Midas BF old combi natural gas boiler. At start up it uses
gas at the rate of 90cuft per hour then drops back to 60cuft per hour.
Over 1 hour it uses 70cuft. If my maths is correct 90cuft equates to about
28Kw.
From the sedbuk site the spec for this boiler states "Power: modulating
20.5 - 20.5 Kw" Is the gas rate on the boiler set too high (I don't have
the service manual for this boiler, so don't know what the rate should
be)?
Any help for my sister-in-laws huge gas bill appreciated!
Gary


The quoted power rating may be its output power. If it uses 28kW to give out
20.5kW then it has an efficiency of 73%, not unusual for an older
non-condensing boiler. My newish Vaillant has a SEDBUCK quoted efficiency of
78%.

Andy