BS EN 13203-1:2025 - Page 2

Gas fired domestic appliances producing hot water. Assessment of performance of hot water deliveries | Status: Current

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:

1. — heat input not exceeding 70 kW; and
2. — 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.