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:
? heat input not exceeding 70 kW; and
? hot water storage capacity (if any) not exceeding 300 l.
In the case of combination boilers, with or without storage, domestic hot water production is integrated or coupled,
the whole being marketed as a single unit.
This document is formed in two parts, which cover two aspects of domestic hot water production.
EN 13203-1 sets out 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. This first part
compliments EN 26, EN 89 and EN 625.
EN 13203-2 sets out a method for assessing the energy performance of the appliances. It defines a number of daily
delivery programmes for each domestic hot water use, kitchen, shower, bath and a combination of these, together
with corresponding test procedures, enabling the energy performances of different gas-fired appliances to be
compared and matched to the needs of the user.