1 Scope
This document is applicable to gas-fired appliances producing domestic hot water.
It applies to both instantaneous and storage appliances; water-heaters and combination
boilers that have:
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— heat input not exceeding 70 kW; and
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— hot water storage capacity (if any) not exceeding 500 l.
A combination boiler can be fitted with a storage tank or not. The domestic hot water production can be integrated or coupled. The product
is considered as a single appliance.
This document specifies in qualitative and quantitative terms the performance in delivery
of domestic hot water for a selected variety of uses. It also gives a system for presenting
the information to the user.