Rads slow to heat up

Discussion in 'Home energy' started by celticbhoy32, Dec 13, 2016.

  1. celticbhoy32

    celticbhoy32 Registered User

    Posts:
    18
    Hi all got a new grant boiler couple of years ago. Thing is when i turn it on, it takes over an hour for the rads to heat up. I have it timed to come on in the mornings at half 6 but its close to 8 before the rads are hot. Any ideas what the prob could be?
     
  2. aprentice

    aprentice Registered User

    Posts:
    37
    Thermostat not opening possibly but you would need someone to look at it
     
  3. Leo

    Leo Moderator

    Posts:
    7,980
    Is this all rads or just one/ a few? Recent problem or was it always the case? When they do finally heat up, is there consistent heat from the bottom to the top of the rad?

    Was a power-flush carried out when you had the boiler replaced(assuming it was a replacement and not a brand new install)? Have you tried bleeding them?
     
  4. jhegarty

    jhegarty Frequent Poster

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    2,861
    Do they all heat at the same speed ?
     
  5. Frank

    Frank Frequent Poster

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    1,575
    make sure the hot water isn't on at the same time.

    If the water is cold this will soak up a lot of heat at the start.
     
  6. Chris2014

    Chris2014 Frequent Poster

    Posts:
    76
    Do they stay cold for an hour then heat up in seconds or gradually heat over an hour?