There are currently three types of hot water systems that are mainly used within the UK: instantaneous, open vented hot water systems and unvented hot water systems. Below is a bit more information on each as a home heating guide.
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"After discovering the bottom part of some of my radiators were never getting warm, I rang Viva Gas for some advice. They were very helpful and sent out an engineer straight away who power flushed my central heating system. It’s now working like it is brand new." - Mrs Swallow