Combi v Conventional boiler

Cardew

The relative advantages of both types of boiler have been discussed endlessly on MSE.


For those interested in technical details this Government report makes interesting reading:


https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/180950/In-situ_monitoring_of_condensing_boilers_final_report.pdf


The executive summary gives most of the information we users need. However amongst the many nuggets I found this observation, which I found rather surprising.

Electricity use by boilers


There is an overall trend of increasing electricity use by fans, pumps and control systems with increasing boiler use, as might be expected.

Trial data indicates on average combination boilers use around 30% more electricity to supply 10,000kWh of heat than regular boilers and around 50% more electricity to supply 20,000kWh
heat.

80% of boilers recorded annual electrical consumption greater than the SAP assumption of 175kW, ranging from around 100kWh/year to over 750kWh/year.

There is a wide variation in boiler electrical consumption between installations supplying similar amounts of heat.

Detailed analysis of electrical and gas consumption of boilers indicated that a key factor in electrical consumption is the pump operating hours/month which is, in turn, dependent upon the setting of the room thermostat, TRVs4 and other controls. As an example, bimodal heating with accurately set room thermostat will minimise electrical consumption against continuous operation with room thermostat set to an unreasonably high value.

C_Mababejive

page not found..

HappyMJ

C_Mababejive wrote: »

page not found..

Remove the space..between report and .pdf. It won't let me post it either. It'll show as %20%20 just remove those bits.

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/180950/In-situ_monitoring_of_condensing_boilers_final_report.pdf

Cardew

Don't know why it won't open.


Try again:

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/180950/In-situ_monitoring_of_condensing_boilers_final_report.pdf

Or Google for:


Final Report: In-situ monitoring of efficiencies of condensing boilers and use of secondary heating

Richie-from-the-Boro

Ere lad.

Edit : 7.1.1 & 7.1.2 gives the comparison of the annual heat efficiencies