BS EN 26:2015

This European Standard defines the specifications and test methods concerning the construction, safety, rational use of energy and fitness for purpose, and also the classification and marking of gas-fired instantaneous water heaters for sanitary uses, hereafter called “water heaters”.

This European Standard applies to water heaters:

• of types A_AS, B₁₁, B_11BS, B₁₂, B_12BS, B₁₃, B_13BS, B₁₄, B₂₂, B₂₃, B₃₂, B₃₃, B₄₄, B₅₂, B₅₃, C₁₁, C₁₂, C₁₃, C₂₁, C₂₂, C₂₃, C₃₂, C₃₃, C₄₂, C₄₃, C₅₂, C₅₃, C₆₂, C₆₃, C₇₂, C₇₃, C₈₂and C₈₃ according to CEN/TR 1749;

• fitted with atmospheric burners;

• equipped with atmospheric burners assisted by a fan for the supply of combustion air or evacuation of combustion products or fully premix burners;

• using one or more combustible gases corresponding to the three gas families and at the pressures stated in accordance to EN 437;

• of nominal heat input not exceeding 70 kW;

• with an ignition burner or with direct ignition of the main burner.

In this European Standard, the heat inputs are expressed in relation to the net calorific value (H_i).

This European Standard does not contain all the requirements necessary for:

• boiling water appliances;

• appliances intended to be connected to a mechanical means of evacuating the combustion products;

• appliances which fulfil a dual role of space heating and heating water for sanitary use;

• appliances making use of the heat of condensation of the water contained in the combustion products;

• water heaters of types B₂₁, B₃₁, B₄₁, B₄₂, B₄₃ and B₅₁.

This European Standard only covers water heaters where the fan, if any, is an integral part of the appliance.

This European Standard:

• does not apply to appliances not intended to be connected to a flue when they are not fitted with an atmosphere sensing device;

• takes account of the information given in Technical Report CR 1472:1994 with respect to marking.

The main symbols used in this European Standard are summarized in Annex F.