Raising product standards for space heating - Part 2: Reducing fossil fuel demand - Department for Energy Security and Net Zero - Citizen Space

Skip to Main Content

Part 2: Reducing fossil fuel demand

In Part 2 we are consulting on the regulatory implementation of the following measures:

all gas combination boilers (≤45kW) to be able to modulate their maximum output down to 15% without on/off cycling by mid-2028
all larger domestic-scale combination boilers (45≥32kW) to be able to modulate their maximum output down to 10% without on/off cycling by mid-2028
all combination boilers to be supplied with a 60 degrees Celsius (°C) low flow temperature factory default setting by mid-2026
raising GB requirement so that temperature control Classes I-III are no longer sufficient by mid-2026
introduce the definition of open protocols into the regulations
all temperature controls and gas combination, system and regular boilers to use open protocols by mid-2026
boilers and temperature controls must, when placed on the market, be accompanied by information about which open protocols they can use
introduce temperature control Classes I-VIII definitions into the regulations
all temperature controls and oil combination boilers to use open protocols by mid-2028

36. Do you agree that all new gas combination boilers (≤45kW) placed on the GB market should be able to modulate their maximum output down to 15% without on/off cycling by mid-2028?

Yes No Don't Know

Please provide evidence or reasoning to support your answer in the box below.

37. Do you agree that the Government should consider introducing an extension for the modulation requirements such that larger domestic-scale gas combination boilers (45≥32kW) placed on the GB market should be able to modulate their maximum output down to 10% without on/off cycling?

Yes No Don't Know

Please provide evidence or reasoning to support your answer.

If you support an increased modulation requirement for larger domestic-scale combination boilers, please suggest a date for when this should come into force.

Day (dd)
-

Month (mm)
-

Year (yyyy)

38. Do you agree that all combination oil boilers (≤45kW) should be capable of modulating their heat output down to 30% of their maximum heat output without on/off cycling, by mid-2028?

Yes No Don't Know

Please provide evidence or reasoning in the box below to support your answer.

39. Do you agree that all combination boilers be supplied with a 60 degrees Celsius (°C) low flow temperature factory default setting by early 2026?

Yes No Don't Know

Please provide evidence or reasoning to support your answer.

40. Do you agree with raising GB requirements so that control Classes I-III are no longer sufficient by mid-2026?

Yes No Don't Know

Please provide evidence or reasoning to support your answer, including any potential costs associated with this proposal in the box below.

41. Please present your views on any potential impacts on heat networks associated with preventing temperature control Classes I-III from the GB market by mid-2026.

Please provide evidence or reasoning in the box below to support your answer.

42. Do you agree with the definitions of temperature control classes IV-VIII set out in the draft SI?

Yes No Don't Know

Please provide evidence or reasoning to support your answer in the box below.

43. Do you agree with the definition of open protocols?

Yes No Don't Know

Please provide evidence or reasoning to support your answer in the box below.

44. Do you agree all gas combination boilers placed on the market should use open protocols by mid-2026?

Yes No Don't Know

Please provide evidence or reasoning to support your answer in the box below.

45. Do you agree oil combination boilers placed on the market should use open protocols by mid-2028?

Yes No Don't Know

Please provide evidence or reasoning to support your answer.

46. Do you agree that an open protocols requirement can be extended to system and regular boilers?

Yes No Don't Know

Please provide evidence or reasoning to support your answer in the box below.

If yes, provide a date from when this should be introduced.

Day (dd)
-

Month (mm)
-

Year (yyyy)

47. Do you agree temperature controls placed on the market must use open protocols by mid-2026?

Yes No Don't Know

Please provide evidence or reasoning to support your answer in the box below.

48. Do you agree with the proposed requirement that boilers and temperature controls must, when placed on the market, be accompanied by information about which open protocols they can use?

Yes No Don't Know

Please explain if you think this is sufficient and if not, how government should go further, including any evidence or reasoning to support your answer in the box below.

49. Please present your arguments for why some closed protocols should remain on the GB market whilst still requiring all combination boilers to use open protocols by mid-2026.

Please provide evidence or reasoning to support your answer in the box below.