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AS 1056.1-1991

[Available Superseded]

Storage water heaters, Part 1: General requirements

Specifies general construction and performance requirements for electric storage water heaters of 25 L to 630 L rated hot water delivery. (Requirements for gas water heaters are specified only by reference to Code AG 102 published by AGA/ALPGA.) To be read in conjunction with AS 1056.2 or AS 1056.3 as appropriate.
Published: 15/04/1991
Pages: 34
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Application
1.3 Referenced documents
1.3.1 Standards
1.3.2 Industrial code
1.4 Definitions
1.5 Compliance with other specifications
1.5.1 Electrical safety requirements
1.5.2 Requirements for gas water heaters
1.5.3 Requirements of water supply and other regulatory authorities
1.6 Rated hot-water delivery/capacity
1.6.1 Electric water heaters
1.6.2 Gas water heaters
1.7 Facilities for maintenance
1.8 Cleanliness in manufacture
2 Construction requirements
2.1 Fixing of heating units to shell
2.2 Sacrificial anodes
2.2.1 Shells lined with vitreous enamel
2.2.2 Shells lined with bonded plastics
2.3 Fittings in contact with water
2.4 Thermal insulation
2.5 Corset
2.6 Casing
2.7 Hydrostatic overpressure withstand
2.7.1 Electric water heaters
2.7.2 Gas water heaters
2.8 Pressure fatigue withstand (of an unvented container)
2.8.1 Electric water heaters
2.8.2 Gas water heaters
2.9 External torque withstand
3 Electrical components
3.1 Heating units
3.1.1 Rating of heating units
3.1.2 Tubular-sheathed immersion heating units General Flange Gasket Material of sheath Isolation of sheath from shell lined with vitreous enamel Power density
3.1.3 Bobbin heating units Fixing facilities Power density
3.1.4 Heating unit support
3.1.5 Location of heating unit Falling-level water heaters Boosting units in displacement water heaters
3.2 Thermostats and thermal cutouts
3.2.1 General
3.2.2 Thermostat setting
3.2.3 Immersed-probe thermostats
3.2.4 Surface-contact thermostats
3.2.5 Thermal cut-out
4 Feed tanks and water fittings
4.1 Attached feed tank
4.1.1 General
4.1.2 Materials
4.1.3 Design and construction
4.1.4 Delivery
4.1.5 Water level
4.1.6 Float-control valve
4.1.7 Overflow
4.1.8 Cover
4.2 Water fittings
4.2.1 Inside diameter
4.2.2 Materials
4.2.3 Plumbing connections to water heater
4.3 Water pipes
4.4 Drainage facilities
5 Marking and installation instructions
5.1 Marking
5.1.1 General
5.1.2 Boosting unit
5.2 Instructions for installation and maintenance
6 Determination of compliance
6.1 Type tests
6.1.1 General
6.1.2 Product documentation
6.2 Routine tests
Appendix A
Appendix B
B.1 Scope
B.2 Principle
B.3 Test apparatus
B.4 Test conditions
B.4.1 Set-up
B.4.2 Air temperature
B.4.3 Air circulation
B.4.4 Thermostat setting
B.4.5 Test voltage
B.4.6 Energization of heating units
B.5 Procedure
B.6 Calculations
B.7 Report
B.8 Examples
Appendix C
C.1 Scope
C.2 Principle
C.3 Test apparatus
C.4 Test conditions
C.4.1 General
C.4.2 Installation of water heater
C.4.3 Insulation of fittings
C.4.4 Cold-water supply
C.4.5 Draw-off facilities
C.4.5.1 Cistern-fed water heaters
C.4.5.2 Free-outlet water heaters
C.4.5.3 Other than cistern-fed and free-outlet water heaters
C.4.6 Thermostat setting
C.4.7 Energization of heating units
C.5 Procedure
C.6 Report
Appendix D
Amendment control sheet
AS 1056.1:1991
Amendment No. 1 (1992)
Revised text
Amendment No. 2 (1995)
Revised text
Amendment No. 3 (1996)
Revised text
Amendment No. 4 (2000)
Amendment No. 5 (2005)
Revised text
Cited references in this standard
National Plumbing and Drainage Code, Part 4: Hot water supply systems
Approval and test specification for thermostats and energy regulators
Approval and test specification - Electric water heaters
Degrees of protection provided by enclosures for electrical equipment (IP Code)
Pipe threads of Whitworth form, Part 2: Fastening pipe threads
Content history
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