Domestic Boiler - Potterton Diplomat

Hi,
Has anyone got any information or experience on these units ?
Its 25-30 years old and overheating.
Thanks Regards
Steven Warner bigfoot com . @ .
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In what way? They're pretty basic boilers.
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Dave Plowman snipped-for-privacy@argonet.co.uk London SW 12
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Steven Warner wrote:

Could have got scaled up or insufficient water flow i.e. pump knackered or air in system or thermocouple faulty ....
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Replace with a new condensing boiler and save 40% in heating bills.
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