Product family
Water heating
Electric storage water heaters and solar water heaters. How their energy test behaves, what Energy Mark reads early, and where each product is regulated.
The test
What the energy test looks like
A storage heater is heated to its set temperature, then left to stand while heat loss is measured, typically over a day. Solar water heaters are tested against set irradiance and draw-off conditions.
The early read
What Energy Mark reads
- Heat-up curve and time to set point
- Early cooling rate during the standing-loss period
- Element duty and thermostat cycling
- Ambient and inlet water temperature
It predicts: Standing loss and rated efficiency, with a range. The certified result still comes from the full test.
Products
2 product categories in this family.
References show the test standard or labelling programme listed for each market. A dot means the category is not listed for that market.
| Product category | India (BEE) | European Union | United States | Australia and NZ |
|---|---|---|---|---|
| Stationary storage electric water heaters (geysers) | IS 2082:1993 and IS 302-2-21:2011 | Water heaters | 10 CFR Part 430 | · |
| Solar water heaters | BEE Schedule 23 | Water heaters | · | · |
Standards by market
The band always comes from the formula your market publishes.
India
IS 2082:1993 and IS 302-2-21:2011 for storage water heaters, BEE Schedule 23 for solar water heaters.
European Union
Ecodesign and energy labelling for water heaters.
United States
DOE 10 CFR Part 430 for consumer water heaters.
Other markets
The applicable national standard and its published formula.
Lab assessment
Find out if your test data can predict your ratings.
We look at your logger exports and completed tests, and tell you plainly whether Energy Mark can work in your lab.