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  1. Chalked

    hot water secondary return check valves

    Use a swing check valve, or a very lightly sprung non return. swing are best, as they won’t restrict the pump. But they will need fitting the correct orientation so the check valve falls to shut.
  2. Chalked

    Hi Advice On Home Magnetic / Electronic De-Scalers

    Magnetic filters do work to some extent. They are proved to reduce hardness by 2-3 degrees Clark ( American measure of hardness). But if you have a local hardness of 20 degrees, it’s still 18. which is still hard water. on my experience in our local area, which is around the 22 degrees level...
  3. Chalked

    Replacement TRV RADIATOR VALVES

    That’s why I use Danfoss. The whole cartridge revolves, so the flow is always the correct way
  4. Chalked

    PHEX 16 Oct at Old Trafford

    Went last year. But too busy this year.
  5. Chalked

    Hep2O into Bullet Reducer

    As long as it’s tight , It will cure and hold pressure straight away. male sure it’s clean and dry.
  6. Chalked

    Hep2O into Bullet Reducer

    Hi all joints into the Ibox need sealing. Ptfe, is ok . But we use loctite 577, or loctite cord.
  7. Chalked

    Drayton TRV4 problems

    Hi Your saying they heat up for 50 mins, then after a further 90mins they don’t come back on? Your heating is only on for 2 hours so they won’t heat up, until there is call for heating. Your trvs can’t call for heat.
  8. Chalked

    Loctite 577 troubles

    Can’t understand why your having trouble. We must have done thousands of rad tails, with zero problems. Where are you applying the sealant?
  9. Chalked

    Vaillant ecoTEC Exclusive 838 problem

    How old is the boiler? And was it commissioned properly.these take a good hour to set and commission. If not done correctly, it will go to comfort mode ( like limp mode on a car)
  10. Chalked

    Durgo position in run?

    Can you install a vent on the outside?
  11. Chalked

    Single/Double/NRV Check Valves Query

    Most modern shower mixers have them built in.
  12. Chalked

    Most reliable underfloor waste connectors?

    Solvent weld. Done properly, won’t pull apart, or sag.
  13. Chalked

    Heating engineer responsibilites.

    Sounds like the system needs an auto bypass. This is something that is either incorporated into the boiler, or fitted external to it. Your contractor should have fitted one. We fit one external to the boiler, even if it has one inside.
  14. Chalked

    Long delay with DHW is an electric boost an option?

    Really depends on your hot water system. But you will find that the costs of installing and materials will be more than the wasted hot water costs, over the lifetime of the electric heater
  15. Chalked

    On - line merchants

    I have an account with Williams ( trade only plumbing). Order befor 5pm for next morning delivery. On Saturday and Sunday too.
  16. Chalked

    Identify a waste pipe part and how to plug it off

    40mm push fit cap end https://www.NoLinkingToThis/p/floplast-push-fit-socket-plug-white-40mm/34151?tc=UB1&ds_kid=92700020953279706&gclsrc=aw.ds&ds_rl=1241687&ds_rl=1245250&ds_rl=1249404&gclid=EAIaIQobChMIloCq3IvH5AIVBLTtCh0DngCaEAQYAyABEgIX5_D_BwE
  17. Chalked

    Anyone identify this fitting?

    Where are you based? I could lend you my crimp gun if your close by. ( North Yorkshire)
  18. Chalked

    Help!! Honeywell CM67 Thermostat

    Depends on the batteries.but it’s a cheap fix. And worth a shot
  19. Chalked

    Help!! Honeywell CM67 Thermostat

    Have you tried replacing the battery
  20. Chalked

    How in the hell do you undo this tap fixing?

    Remove the pop up waste bar from the tap and looking from underneath, the threaded rod has an Allen key hole in the centre. Undo the rod anti clockwise.

We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.

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