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Discuss New radiator goes cold after an hour in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Andrew Morris

    Andrew Morris New Member

    Hi guys please be nice I'm not in the trade ☺️

    Fitted two rads yesterday to an existing system one to replace an old one and another one totally new and extended the rad circuit. The issue I have is they warm up perfectly but after about an hour or so one goes cold. The rad isn't the last in last in circuit the other new one comes after it. I've used this rad Kudox Premium Type 21 Double-Panel Plus Single Convector Radiator 600 x 1200mm White with this Drayton RT212 White / Chrome TRV & Lockshield 15mm x ½".
    Does the trv have a built in thermostat which is cutting the feed as the room has hit temperature? There is no other room thermostat. I'm thinking this is the issue but was hoping someone could confirm this.

    Cheers Andy
     
  2. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Thats how the trv works , it senses the air temp around it and closes off the flow to the rad , assuming of course the room is up to the required temp as selected by the trv setting , ie 1 to 5
     
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  3. Andrew Morris

    Andrew Morris New Member

    townfanjon thanks for your reply
     
  4. Riley

    Riley Plumber GSR Top Contributor!!

    Or is it teed off another radiators feed?
     
  5. Andrew Morris

    Andrew Morris New Member

    Hope the image explains it. I think I've done what you've said

    Imgur
     
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    pic of the rad and pipework
     
  7. Andrew Morris

    Andrew Morris New Member

  8. scott_d

    scott_d Plumber GSR

    What size pipe?
     
  9. Andrew Morris

    Andrew Morris New Member

    10mm scott
     
  10. scott_d

    scott_d Plumber GSR

  11. Riley

    Riley Plumber GSR Top Contributor!!

    There’s your answer. My friend 10mm won’t carry enough heat for two rads
     
    • Like Like x 1
  12. Andrew Morris

    Andrew Morris New Member

    Which to a uneducated person is? All the pipe on existing rads in the house is 10mm or is it the fact I've joined another rad to one with which is 10mm i take it should be from a bigger pipe somewhere?
     
  13. SimonG

    SimonG Trusted Plumber Top Contributor!!

    Take your 10mm back to manifold.
     
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    • Agree Agree x 1
  14. Andrew Morris

    Andrew Morris New Member

    Thanks guys and sorry.. So basically find the manifold and connect the new directly to that so the rads aren't sharing the feed and then the rads will get the heat benefit. One last question from what you can see it's not dangerous atm or what I have done could it damage the boiler? Really sorry to bother you guys I really wouldn't ask but if I could afford to get someone I wouldn't have done this.
     
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    theres your reason
     
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