Gas System Boilers provide hot water for the central heating system and hot water for a storage tank. They take their water from the mains supply and do not need a tank in the attic.
Combi or Combination gas boilers provide instant hot water and heating as water for the heating system and the provision of hot water is combined. This removes the need for a hot water storage tank or cylinder making it ideal for compact properties where space is at a premium.
Heat Only gas Boilers are often the best option for replacing an existing boiler with cold water storage in the attic and an existing cylinder. Heat Only Boilers are ideally suited for homes where there is a high demand for hot water.