I've two questions to understand?
1.If I'm looking to fit an unvented cylinder with a system boiler to a new self-build, well insulated air tight home, because of UFH ground floor and radiators 1st floor, I've been advised to run the heating water temperature at 60C. Someone in an older post also said that new builds need the DHW stored at 65C to prevent legionella and then have TMV installed to bring this down at the taps.
If the space heater water passing through the coil in the UVC heats the DHW around it, then how can 60 degree CH water heat the DHW to 65?
2. What exactly is short cycling of the boiler. I have a 1960 poorly insulated house with a combi boiler, in cold winter, the heating comes on and off on average every 1.5hrs for 15-20 minutes at a time from memory. I thought short cycling was when a boiler is having to come on little and often & so being inefficient.
In a well insulated new build, if you do a good job of it, surely the space heating will only come on & off a couple of times per day so there won't be any short cycling, but i keep seeing it mentioned, I must be looking at it the wrong way?
1.If I'm looking to fit an unvented cylinder with a system boiler to a new self-build, well insulated air tight home, because of UFH ground floor and radiators 1st floor, I've been advised to run the heating water temperature at 60C. Someone in an older post also said that new builds need the DHW stored at 65C to prevent legionella and then have TMV installed to bring this down at the taps.
If the space heater water passing through the coil in the UVC heats the DHW around it, then how can 60 degree CH water heat the DHW to 65?
2. What exactly is short cycling of the boiler. I have a 1960 poorly insulated house with a combi boiler, in cold winter, the heating comes on and off on average every 1.5hrs for 15-20 minutes at a time from memory. I thought short cycling was when a boiler is having to come on little and often & so being inefficient.
In a well insulated new build, if you do a good job of it, surely the space heating will only come on & off a couple of times per day so there won't be any short cycling, but i keep seeing it mentioned, I must be looking at it the wrong way?