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Home > Off Topic > Central heating experts: Is my boiler knackered.. |
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Steve D Member Since: 19 Jan 2013 Location: Essexshire Posts: 4109 |
...or am I being spun a yarn?
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9th Jan 2017 7:10 am |
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Dartman the one Member Since: 04 Apr 2013 Location: Seville, Spain Posts: 1687 |
I would suggest it is more to do with the H/W setting on your pressurised H/W tank thermostat, as you say it's only a couple of 22mm pipes to the tank indirect heating, therefore the heat is dissipated in the H/W tank. Should the boiler hot water setting be too high it cannot dissipate the heat into the H/W tank 50deg C is plenty hot enough for hot water though many are set at 60deg, really a waste of gas. Now that you are on a pressurised system it may well be that the new pressurised H/W tank does not have the same surface area or route that the old indirect tank had and therefore not be able to dissipate the heat at a fast enough rate, is the safety trip adjustable or knackered and is set low? the settings would be different for a atmospheric and pressurised system, the object being not to boil the water in the heat exchanger so will cut out in the low 90's to account for latent heat continuing to heat the water after shutting off the flame. my PC is slightly to the right of Genghis
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9th Jan 2017 8:49 am |
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simong_uk Member Since: 31 Jan 2014 Location: Sutton Coldfield Posts: 146 |
I fitted a rad for almost exactly that reason for my folks - works a treat!
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9th Jan 2017 8:58 am |
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Steve D Member Since: 19 Jan 2013 Location: Essexshire Posts: 4109 |
I'll try knocking down the immersion tank and boiler temperatures a little to see if that makes any difference. There is a relief valve and that is now fully open. The plumbing co. said I could try that but it might starve some or all of the furthest radiators from getting hot when the heating is on but they all still get hot. Don't know if the safety trip is adjustable but they have already replaced that (is that the boiler 'stat?) at the same time as they changed the overrun stat. I know they changed two stats in the boiler but at work now so cant see invoice to confirm.
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9th Jan 2017 9:18 am |
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