Boilers

(asked on 18th June 2019) - View Source

Question to the Department for Business, Energy and Industrial Strategy:

To ask the Secretary of State for Business, Energy and Industrial Strategy, pursuant to the Answer of 11 June 2019 to Question 258963 on Boilers, how the variables to which he refers affect the efficiency of the boiler itself as distinct from the whole heating system; and if will he make a statement.


Answered by
Chris Skidmore Portrait
Chris Skidmore
This question was answered on 25th June 2019

Of the variables referred to, those that impact the efficiency of the boiler itself are the heat distribution system, comprising emitters, pipes and pumps and the user controls.

Condensing boiler efficiency is typically improved by a lower water return temperature. The design, efficacy and maintenance of the heat distribution system can impact this temperature. For example, an undersized system will require a higher flow temperature making it more difficult to achieve a low return temperature.

User controls such as timers and thermostats can impact when the boiler turns on and off. The rate of this (cycling) can also impact the efficiency of the boiler with rapid cycling being potentially detrimental to efficiency. User controlled radiator valves can affect the flow rate through the system also impacting flow and return temperatures and cycling affecting boiler efficiency.

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