Historical
ANSI/ASHRAE 124-2007
Methods of Testing for Rating Combination Space-Heating and Water-Heating Appliances
This test method is intended to cover electric, gas-fired,and oil-fired combination space-heating and water-heating appliances. This standard covers appliances up to 300,000 Btu/h(87.9 kW) rated input.
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]