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  • FIRST POST
    • jem16
    • By jem16 6th Mar 10, 4:41 PM
    • 18,364Posts
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    jem16
    Old radiator output vs new radiator
    • #1
    • 6th Mar 10, 4:41 PM
    Old radiator output vs new radiator 6th Mar 10 at 4:41 PM
    Currently I have in my kitchen an old double radiator (no fins) - size is approx 590mm by 800mm.

    My mum is redoing her bathroom and is replacing her radiator with a heated towel radiator so has a reasonably new radiator I could use. It's a single panel, single fin of approximately 600mm by 700mm.

    Can anyone tell me if I lose/gain much heat by replacing my old double radiator with no fins with a new single radiator with single fins?
Page 1
    • Homersimpson
    • By Homersimpson 6th Mar 10, 10:11 PM
    • 334 Posts
    • 231 Thanks
    Homersimpson
    • #2
    • 6th Mar 10, 10:11 PM
    • #2
    • 6th Mar 10, 10:11 PM
    I think you will loose heat output with a smaller single radiator, the fins won't make that much difference.
    • *j*
    • By *j* 6th Mar 10, 10:27 PM
    • 199 Posts
    • 102 Thanks
    *j*
    • #3
    • 6th Mar 10, 10:27 PM
    • #3
    • 6th Mar 10, 10:27 PM
    If you search radiators on the wickes.co.uk website they give you the output of the various sized radiators in watts. A double approx 600 x 800 gives out about 1400w, and the single 600 x 700 is about 700w.

    I realise the towel rail would add a bit to that.

    The output drops by about a half, but do you need 1.4 kw to heat the bathroom? Is the original double rad oversized??

    *j*
    • jem16
    • By jem16 6th Mar 10, 10:38 PM
    • 18,364 Posts
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    jem16
    • #4
    • 6th Mar 10, 10:38 PM
    • #4
    • 6th Mar 10, 10:38 PM
    If you search radiators on the wickes.co.uk website they give you the output of the various sized radiators in watts. A double approx 600 x 800 gives out about 1400w, and the single 600 x 700 is about 700w.
    Originally posted by *j*
    All the new radiators are convector radiators which I can find out the output for fairly easily.

    My question was what was the ouput of an old, non convector type radiator which is no longer made.

    I realise the towel rail would add a bit to that.
    The towel rail is nothing to do with me. It's my mother who is replacing a convector radiator with a towel rail.

    The output drops by about a half, but do you need 1.4 kw to heat the bathroom? Is the original double rad oversized??
    I'm not heating the bathroom - my mother is.

    I'm heating the kitchen.
    • KeithP
    • By KeithP 7th Mar 10, 1:25 AM
    • 3,135 Posts
    • 1,353 Thanks
    KeithP
    • #5
    • 7th Mar 10, 1:25 AM
    • #5
    • 7th Mar 10, 1:25 AM
    You can also find the heat output for older radiators fairly easily too.

    Page four of this document A Guide to Radiator Sizes and Heat Output covers the old 'without fins' radiators.
    The heat output is in watts per metre length.
    Just because I've written it doesn't mean that
    either you or I have to believe it.
    • jem16
    • By jem16 7th Mar 10, 9:16 AM
    • 18,364 Posts
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    jem16
    • #6
    • 7th Mar 10, 9:16 AM
    • #6
    • 7th Mar 10, 9:16 AM
    You can also find the heat output for older radiators fairly easily too.

    Page four of this document A Guide to Radiator Sizes and Heat Output covers the old 'without fins' radiators.
    The heat output is in watts per metre length.
    Originally posted by KeithP
    Thanks - that's exactly what I'm after.
    • *j*
    • By *j* 7th Mar 10, 10:08 AM
    • 199 Posts
    • 102 Thanks
    *j*
    • #7
    • 7th Mar 10, 10:08 AM
    • #7
    • 7th Mar 10, 10:08 AM
    I'll need to remember to read more carefully.

    That will teach me to post replies at 10:30 on a Saturday evening!!

    *j*
    • vaio
    • By vaio 7th Mar 10, 2:35 PM
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    • 8,837 Thanks
    vaio
    • #8
    • 7th Mar 10, 2:35 PM
    • #8
    • 7th Mar 10, 2:35 PM
    for non convectors the output is generally proportional proportional to area, the the old 750 high single panel ones are about 1 kW per metre length, making it double panel adds about 60% and fins will add another 25%

    Your existing one will be about (590 x 800 / 750 x 1.6) = 1 kW, the new one will be about (600 x 700 / 750 x 1.25) = 700 watts
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