ASHRAE 118.1 : 2012

Foreword
1 Purpose
2 Scope
3 Definitions and Symbols
4 Classifications by Mode of Operation
5 Requirements
6 Instruments
7 Apparatus
8 Methods of Testing
9 Test Procedures
10 Calculation of Results
11 References
Informative Appendix A - Correction to Heating Value, H,
                         for a Fuel Gas
Informative Appendix B - Method of Estimating Energy
                         Required for Heating
                         Daily Quantity of Hot Water, U,
                         in Gallons (Litres) Exclusive of
                         Distribution Piping System Losses

Gives test procedures for determining the efficiency and hot-water delivery capability of the water-heating equipment to which it applies.

2.1 This standard provides test procedures for determining the efficiency and hot-water delivery capability of the waterheating equipment to which it applies.2.2 This standard applies to electric resistance, heat pump,gas-fired, and oil-fired water-heating equipment, including hot-water supply boilers, with input ratings less than 12,500,000 Btu/h (3660 kW) and greater than the following: Electric resistance 12 kW Heat pump 6 kW (20,500 Btu/h) (including all three-phase, regardless of input) Gas-fired 75,000 Btu/h (22 kW) (see Section 2.3) Oil-fired 105,000 Btu/h (31 kW) 2.3 This standard does not apply to gas-fired service waterheating equipment that a. has a storage capacity of less than two gallons,b. is designated to deliver water at a controlled temperature of less than 180°F (82°C), and c. has an input rating less than 200,000 Btu/h (59 kW).