Systen boiler or heating only boiler

Joined
4 Aug 2007
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Location
Ayrshire
Country
United Kingdom
I was looking for a boiler to replace and old one. The system will still have a hw cylinder. In a brochure i have there are system boilers and heating only boilers, whats the difference
 
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Joined
28 Jan 2006
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London
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United Kingdom
system boiler is sealed system and has pump expansion tank etc, heat only has nothing and relies on all existing gear, pump, F&E etc
 
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