1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Boiler Stove / Thermal store system design

Discussion in 'Plumbing and Central Heating' started by Rickytickytavi, 22 Nov 2019.

  1. Rickytickytavi

    Rickytickytavi

    Joined:
    22 Nov 2019
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi,I’m planning on installing a boiler stove and thermal store and would be chuffed if someone in the know could take a look at my design and tell me if it’s feasible/safe/legal. It’s a bit of an awkward system because the thermal store has to be on the same level as the stove and the pipe work has to go up and down to reach the store. I put a heat loss radiator above the stove with a check valve on the outlet, the idea being that the stove will thermosyphon through the radiator via the check valve when the pump is not running and when the pump is running the check valve will stop backflow through the radiator. See what you think

    many thanks

    richard
     

    Attached Files:

  2. Sponsored Links
  3. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,342
    Thanks Received:
    3,077
    Location:
    Daventry
    Country:
    United Kingdom
    I think you've identified the problem yourself - the thermal store is on the same level as the stove, and it's not heated by gravity circulation. The thermal store tappings need to be at least a metre above the stove tappings (centre to centre) and the pipework should rise continuously from stove to store.
     
    • Thanks Thanks x 1
  4. Rickytickytavi

    Rickytickytavi

    Joined:
    22 Nov 2019
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks for the reply muggles. Unfortunately I can’t position the stove or the boiler anywhere else so have to try a workaround. The pump should circulate the water through the store and stove normally but if there is an issue with the pump or there’s a power cut then gravity circulation through the heat loss radiator would take over to prevent overheating of the stove if it happens to be lit at the time. I’m no expert but I can’t see why this wouldn’t work, not sure if it complies with the regs tho.
     
  5. Terrywookfit

    Terrywookfit

    Joined:
    19 Jul 2007
    Messages:
    5,779
    Thanks Received:
    1,096
    Country:
    United Kingdom
    Can you get the return below floor level.
     
  6. Rickytickytavi

    Rickytickytavi

    Joined:
    22 Nov 2019
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    I could route the return pipe under the downstairs floorboards, it would mean a bit more work lifting more floorboards tho. Do you think this would help?
     
  7. Terrywookfit

    Terrywookfit

    Joined:
    19 Jul 2007
    Messages:
    5,779
    Thanks Received:
    1,096
    Country:
    United Kingdom
    Yes....It was normal practice on one pipe gravity systems.
     
    Last edited: 23 Nov 2019
    • Thanks Thanks x 1
  8. Rickytickytavi

    Rickytickytavi

    Joined:
    22 Nov 2019
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    I’ll change the plans and reroute this pipe then, thanks for the advice
     
  9. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    What is the purpose of the 3 port valves?
    Seems like it is adding unnecessary complication.
    The return stat on the stove should be wired as a standard hi-lo configuration with the Hi stat.
    Which allows the return stat to energise the pump.
    The Hi stat is just a back up.
     
    Last edited: 23 Nov 2019
  10. Sponsored Links
  11. Rickytickytavi

    Rickytickytavi

    Joined:
    22 Nov 2019
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    The valve on the stove circ pump is to control the temperature of the water being supplied to the stove as I read somewhere this will improve efficiency. The valve on the right of the diagram is to control the temperature of the water in the radiator circuit. You are right in that it’ll work without them and I may leave them out when it comes to installing the system
     
  12. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    Are you using the thermal store to provide hot water to the taps?
     
  13. Rickytickytavi

    Rickytickytavi

    Joined:
    22 Nov 2019
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    Yes radiators and hot water, didn’t show it in the drawing tho. I’m planning to get a cylinder with a coil in it for the hot water
     
  14. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    Taking CH off at the level in your diagram will leave you with little or no hot water.
     
    • Thanks Thanks x 1
  15. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    Far better to pump Ch straight to the rads. Which will be the excess.
    The hot water already hot.
    Which is how these systems are traditionally plumbed.
     
    • Thanks Thanks x 1
  16. Rickytickytavi

    Rickytickytavi

    Joined:
    22 Nov 2019
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    Ok, I’ll put the ch pipes further down the cylinder. Do you mean pump the water straight to the rads without a three way valve?

    cheers
     
  17. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    • Thanks Thanks x 1
Loading...

Share This Page