Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 12 replies
  • Subscribers 32 subscribers
  • Views 1855 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Heating thermostat and building regs ?

aligarjon

Hi guys, maybe slightly off topic.  I have been asked by a customer to relocate her heating thermostat in a new build.  I haven't seen it yet so don't know the full picture but she says it is located in her attic room and doesn't shut off when they want  because it doesn't get warm enough or the rest of the house stays on because it's colder up there, so i am presuming it's a 3 storey house.  It seems a bit odd to me on the face of it, especially as it's June.  i thought each floor should have its own zone and thermostat to comply with building regs, is that correct.  This is just a standard wet system with radiators.

 

 

Gary

  • 0

    It does seem to be an odd place to put the thermostat, but whether it complied with building regs must depend upon when it was installed.

    I am not sure that one is required if TRVs are installed.

  • 0

    If it’s a new build it should have more than one heating zone with each having its own thermostat and programmer.

    They might just need someone to talk them through setting the heating controls.

  • 0

    Chris Pearson: 
     

    It does seem to be an odd place to put the thermostat, but whether it complied with building regs must depend upon when it was installed.

    I am not sure that one is required if TRVs are installed.

     

    You need a room stat with TRVs to stop the boiler cycling on an off when the TRVs are satisfied and the water is circulating through the bypass valve or radiator.

  • 0

    I did swap the mother in laws system around, there was a wireless room stat and a radiator in her hallway without a TRV, so I moved a TRV from her lounge to the hallway radiator and moved the wireless stat to the lounge. Her bills went down and she is much more comfortable as the stat is in the room where she spends most of her time.

  • 0

    The stat should be in the coldest room of the house, so that one gets warm before the boiler and pump shut down. Then the other rooms temperatures can be reduced as necessary by the TRVs. 

    regards

  • 0

    Most old ladies living alone don’t heat the spare bedrooms and the other rooms they don’t use daily, they are of an age where you went to bed with a hot water bottle and lots of blankets and don’t always heat the bedroom they do use much.

    The reason the room stat was traditionally fitted in the hall that when the central heating was installed the open fire or gas fire was retained in the living room and if that was lit it knocked the central heating off. You don’t need a high temperature in the hallway so it’s not a good location for the stat, the mother in law is in a three story house and the boiler never shut down, it just kept cycling because all the heat from the hall radiator was lost into the upper floors.

  • 0

    I can foresee @aligarjon ending up having a cup of tea and a biscuit whilst explaining the heating controls.

  • 0

    burn: 
     

    The stat should be in the coldest room of the house, so that one gets warm before the boiler and pump shut down. Then the other rooms temperatures can be reduced as necessary by the TRVs. 

    regards

    That was indeed the case  … but is now considered of date as it consumes a lot more fuel than more modern approaches - thus part L of the building regs (Conservation of fuel and power) don't allow that any more for new builds.

       - Andy.

  • 0

    Sparkingchip: 
     

    Chris Pearson: 
     

    It does seem to be an odd place to put the thermostat, but whether it complied with building regs must depend upon when it was installed.

    I am not sure that one is required if TRVs are installed.

     

    You need a room stat with TRVs to stop the boiler cycling on an off when the TRVs are satisfied and the water is circulating through the bypass valve or radiator.

    I suspect that it is rare that all the TRVs are satisfied at the same time - a bit like diversity in our world. If they were, and the one radiator (or towel rail) without, or bypass valve were the only heat emitters, the return temperature would shut off the boiler. However, I do recognise that short cycling is not a good thing. We don't have a thermostat upstairs, but it is a gravity system. The worst case is that the underfloor void gets toasty warm, but the heat has to go somewhere so will heat the rooms.

    So do you put the thermostat in the room with the non-TRV radiator, or elsewhere?

  • 0

    I was stood looking at an old gravity system last week with a couple of plumbers who have to replace the hot water cylinder tank stand and fix some leaks, because the tank has dropped a bit.

    Although it’s a gravity system it still has some controls including a thermal balancing valve in the hot water cylinder return pipe to the boiler to divert the flow to the radiators, it’s a bit of a brutal way of controlling the cylinder temperature but even a simple gravity systems need keeping under control.

    https://www.danfoss.com/en-gb/products/dhs/valves/hydronic-balancing-and-control/thermal-balancing-valves/#tab-overview

Community Rules & Guidelines