Information for SuperHeat users:

Gas boiler classification

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The Primary Heating System page in SuperHeat 5 lists a number of boiler types taken from SAP-2001 and it is important that you identify the correct one. Dates (e.g. 1985 to 1997) refer to the date of manufacture - choose an earlier date if in doubt.

A low capacity boiler is one with a copper heat exchanger or one whose heat exchanger contains less than 5 litres of water (this includes many modern wall-hung boilers with cast-iron heat exchangers: check the manufacturer's details). Select 'high or unknown capacity' if in doubt.

A combination boiler ('combi') is an appliance that provides heating and directly provides hot water. A storage combi has an internal store containing between 15 and 70 litres of water. This is either a primary store: most of the water in the store is common with the heating circuit, or a secondary store: most of the water in the store is directly usable as domestic hot water. If you are entering manufacturer's details, select the appropriate type of combi (by date and condensing/non condensing) and then the appropriate type of store and its volume on the DHW page; this is done automatically if you select a combi from the SEDBUK database. Where the generic efficiency from Table 4b is used, any storage is ignored as the effect of this is allowed for in the tabulated efficiency. Some non-storage combis have a 'keep-hot' facility which, as the name suggests, maintains the temperature of the small quantity of stored water within the combi so that hot water is immediately available from taps. Again, no allowance for this is made when Table 4b efficiencies are used, but if the SEDBUK database identifies a combi as having a 'keep-hot' facility, account is taken of this in the SAP worksheet.

A condensing boiler (or combi) is one that is designed to recover the latent heat in the products of combustion by condensing the water vapour within the appliance.

A Combined Primary Storage Unit (CPSU) is a single floor-standing appliance designed to provide space heating and hot water. The burner heats a store containing at least 70 litres (if the store is less than 70 litres it is treated as a storage combi) and the water in this store is circulated round the heating circuit. Hot water is heated instantaneously by running the water through a heat exchanger coil in the store (i.e. in the reverse manner to an indirect h.w. cylinder) making it easy to provide mains pressure hot water without the delay associated with non-storage combis. The Gledhill Gulfstream is one of the few products of this type.

Our QSEDBUK boiler database browser program

With SuperHeat the Misc, Boiler Database Browser option lists virtually all domestic boilers that are currently available. Double click on any entry for more information. Our free QSEDBUK boiler database browser (also included on all SuperHeat CD's) provides a free-standing front end to the same data.

Links to selected boiler manufacturer's sites:

Links to third party sites are provided purely to assist you and nothing should be inferred from the inclusion or omission of any company name

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