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BS EN 26:2023

BS EN 26:2023

$215.11

Gas-fired instantaneous water heaters for the production of domestic hot water

Published By Publication Date Number of Pages
BSI 2023 172
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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 AAS, B11, B11BS, B12, B12BS, B13, B13BS, 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 (Hi). 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 CEN/CR 1472:1994 with respect to marking. Type B appliances should be with a combustion products discharge safety device to comply with essential requirement 3.4.3 of the Gas Appliances Directive 2009/142/EC. In this European Standard, the appliance is identified as type B11BS. Appliances intended to be installed outdoors or in a room separate from inhabited rooms and provided with appropriate ventilation are not required to have this combustion products discharge safety device but, in this case, appropriate warnings on the packaging, and in the instructions should clearly define the limited authorized use for this type of appliance. In this European Standard, the appliance is identified as type B11. The main symbols used in this European Standard are summarized in Annex F.

PDF Catalog

PDF Pages PDF Title
2 undefined
11 1 Scope
2 Normative references
14 3 Terms and definitions
30 4 Classification
5 Constructional requirements
31 5.2.1.1 General
32 5.2.1.2 Use of Zinc alloy
5.2.2.1 Metallic materials
35 5.2.7.1 Gas connections
5.2.7.2 Connection to the water circuit
36 5.2.8.1 Soundness of the gas circuit
5.2.8.2 Soundness of the combustion circuit
37 5.2.9.1 All appliances
5.2.9.2 Type AAS appliances
5.2.9.3 Type B appliances
38 5.2.9.4 Separate combustion products evacuation duct
5.2.9.5 Type C appliances
39 5.2.9.6 Special requirements for certain components of water heaters with a fan
41 5.2.12.1 General
5.2.12.2 Controls
45 5.3.7.1 Ignition burner
46 5.3.7.2 Manual ignition of the ignition burner
5.3.7.3 Automatic ignition device
5.3.8.1 General
47 5.3.8.2 Thermoelectric device of a permanent ignition burner
5.3.8.3 Flame supervision device of an appliance with an intermittent safety ignition burner
5.3.8.4 Flame supervision devices for automatic burner control systems
49 5.3.13.1 Protection against frost
5.3.13.2 Protection against the ingress of rain
50 5.5.2.1 Requirements
5.5.2.2 Test conditions
51 6 Operational requirements
6.1.6.1 General
6.1.6.2 Test room
6.1.6.3 Conditions of installation
53 6.1.6.4 Water supply
6.1.6.5 Measurement uncertainties
55 6.1.6.6 Adjustment of the appliance
56 6.1.6.7 Testing conditions
6.1.6.8 Electrical supply
6.2.1.1 Requirement
6.2.1.2 Test
57 6.2.2.1 General
58 6.2.2.2 Soundness after reassembly
6.2.2.3 General requirements
6.2.2.4 Soundness of the air supply and combustion product circuit type C appliances
60 6.2.2.5 Soundness of the combustion product circuit of Type B appliances
63 6.2.3.1 Requirements
6.2.3.2 Tests
6.3.1.1 Heat input obtained
64 6.3.1.2 Corrected heat input
65 6.3.2.1 Appliances without a preset adjuster
6.3.2.2 Appliances with preset adjusters
66 6.3.3.1 Requirement
6.3.3.2 Test
68 6.7.1.1 Requirements
6.7.1.2 Test
69 6.7.2.1 Requirements
70 6.7.2.2 Tests
6.7.3.1 Requirements
6.7.3.2 Tests
71 6.7.3.3 Resistance to draught for water heaters intended to be installed outside and/or in a partially protected place
72 6.7.4.1 Requirements
6.7.4.2 Tests
6.7.5.1 Requirements
6.7.5.2 Tests
73 6.7.6.1 Requirements
6.7.6.2 Tests
6.7.7.1 Requirements
6.7.7.2 Tests
6.7.8.1 Requirements
6.7.8.2 Tests
6.7.9.1 Requirements
6.7.9.2 Tests
6.7.10.1 Requirements
74 6.7.10.2 Tests
6.7.11.1 Requirements
6.7.11.2 Tests
6.7.12.1 General
6.7.12.2 Supervision of the combustion air rate and the combustion products rate
75 6.7.12.3 Gas/air ratio controls
76 6.7.12.4 Endurance of the gas/air ration control
6.7.12.5 Adjustment of the gas/air ratio
6.7.12.6 Supplementary test for type B water heaters with draught diverter
77 6.7.13.1 Requirements
6.7.13.2 Test
6.7.14.1 General
6.7.14.2 Verification of the protected nature of a combustion chamber
78 6.7.14.3 Verification of normal ignition in a combustible air/gas mixture for types C12 and C13 water heaters
6.7.15.1 Requirements
6.7.15.2 Test
6.7.16.1 Requirement
79 6.7.16.2 Test
6.8.2.1 Rotary knob
6.8.2.2 Push-button
6.8.3.1 Sealing force
80 6.8.3.2 Opening and closing function
6.8.3.3 Closing time
6.8.3.4 Endurance
81 6.8.4.1 Automatic ignition devices
6.8.4.2 Heat input of ignition burners
82 6.8.5.1 Appliances with a thermoelectric device
6.8.5.2 Appliances with an intermittent safety ignition burner
6.8.5.3 Appliances with automatic burner control systems
84 6.8.6.1 Requirement
85 6.8.6.2 Test
6.8.7.1 Requirement
6.8.7.2 Test
6.8.8.1 Requirement
86 6.8.8.2 Test
6.8.9.1 Requirements
6.8.9.2 Tests
6.8.10.1 Sensitivity of the device to lack of ventilation in the room
87 6.8.10.2 Sensitivity of the device to fouling of the heating body
88 6.8.10.3 Operating defect of the device
6.8.11.1 General
6.8.11.2 Test conditions
89 6.8.11.3 Nuisance shutdown
6.8.11.4 Shutdown times
91 6.9.2.1 General
92 6.9.2.2 Test in still air
93 6.9.2.3 Water heaters using gas/air ratio controls
6.9.2.4 Supplementary tests
95 6.9.3.1 General
96 6.9.3.2 Weighting
97 6.9.3.3 Calculation of emissions of NOX in mg/kWh based on GCV
98 6.13.1.1 Requirements
99 6.13.1.2 Test conditions
6.13.2.1 Requirement
6.13.2.2 Test conditions
100 7 Rational use of energy
102 8 Fitness for purpose
8.2.1.1 Requirements
8.2.1.2 Tests
8.2.2.1 Requirements
8.2.2.2 Tests
8.2.3.1 Nominal working combustion products temperature
8.2.3.2 Overheat combustion products temperature
103 8.2.4.1 General
8.2.4.2 Compressive strength
104 8.2.4.3 Lateral strength
105 8.3.2.1 Characterization
8.3.2.2 Long-term resistance to thermal load
107 8.3.2.3 Long-term resistance to condensate exposure
108 8.3.2.4 Resistance to condensing/non-condensing cycling
109 8.3.2.5 Resistance to ultraviolet radiation (UV)
110 8.3.2.6 Geometrical stability
8.3.2.7 Reaction to fire
8.4.1.1 Requirements
8.4.1.2 Test conditions
111 8.4.2.1 Requirements
8.4.2.2 Test conditions
8.4.3.1 Requirements
112 8.4.3.2 Test conditions
8.4.4.1 Requirements
8.4.4.2 Test conditions
113 8.4.5.1 Requirements
8.4.5.2 Test conditions
8.4.6.1 Requirements
8.4.6.2 Test conditions
8.4.7.1 Requirements
8.4.7.2 Test conditions
114 8.4.8.1 Durability – Requirements
8.4.8.2 Strength
8.5.1.1 Requirement
8.5.1.2 Test
8.5.2.1 Requirements
8.5.2.2 Tests
8.5.3.1 Requirement
8.5.3.2 Test
115 8.5.4.1 Requirement
8.5.4.2 Test
8.5.5.1 Normal and high water pressure appliances
8.5.5.2 Low water pressure appliances
116 8.5.6.1 Fixed output or adjustable output appliances
117 8.5.6.2 Appliances with automatic output variation
120 8.5.7.1 Requirement
8.5.7.2 Test
122 9 Marking and instructions
123 9.1.3.1 General
9.1.3.2 Composition of packaging
124 9.1.4.1 Presence of warning notices on water heater and packaging
9.1.4.2 Content of warning notices on water heater and packaging
125 9.2.1.1 General
127 9.2.1.2 For installation and adjustment of the gas circuit
9.2.1.3 For installation of the domestic hot water
9.2.1.4 For installation of the combustion circuit
131 9.2.2.1 Presence of instructions for use and servicing
9.2.2.2 Content of instructions for use and servicing
132 9.2.2.3 For type AAS appliances
9.2.2.4 For type B11BS, B12BS, B13BS appliances
9.2.2.5 For type C appliances
133 9.2.3.1 Conversion instructions for the installer
9.2.3.2 Modification of warnings after conversion
134 10 Nitrogen oxides emissions
11 Sound power level (LWA)
135 12 Figures referenced in this standard
147 Annex A (informative)National situations
A.1 General
A.2 Gas connections in common use in the various countries
150 A.3 Flue pipe diameters in force in the various countries
151 Annex B (normative)Test apparatus for type C1, C3, B4 and B5 water heaters (see 6.7.3.2)
155 Annex C (normative)Test apparatus for type C21 appliances (see 6.7.4.2)
156 Annex D (normative)Description of the sealed room for the tests of type AAS appliances (see 6.8.10.1.2.1)
D.1 Configuration of the sealed room
D.2 Soundness of the room
D.3 Effectiveness of mixing
D.4 Equipment of the room
157 Annex E (informative)Soundness of the gas circuit test – Volumetric method(6.2.1)
E.1 Equipment
E.2 Test method
158 Annex F (informative)Principal symbols and abbreviations used
160 Annex G (informative)Guidelines for extension to other appliances categories
161 Annex H (normative)Lists of materials currently used for the construction of the gas water heaters
H.1 General
H.2 Special types of steel
H.3 Copper and copper alloys
162 H.4 Plastic materials
163 Annex I (normative)Test methods to determine the effects of to long-term thermal load, long-term condensate exposure, condensing/ non-condensing cycling and resistance to UV radiation
164 Annex J (informative)NOx conversion calculation
166 Annex K (normative)Parts in copper or copper alloys
167 Annex L (informative)Compilation of the test conditions for the various gas families
169 Annex M (informative)Alternative Method for the determination of the nominal heat input or the maximum and minimum heat input (according to 6.3.1) for appliances using a pneumatic gas/air ratio control system

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BS EN 26:2023
$215.11