Schedule 2 THE EFFICIENCY REQUIREMENTS
Boilers must comply with the useful efficiency requirements set out in the Table below —
(a)
at rated output, that is, operating at rated output Pn expressed in kW, at an average boiler-water temperature of 70°C, and
(b)
at part load, that is, operating at 30% part load, at an average boiler-water temperature which varies according to the type of the boiler.
Table
| Type of boiler | Range of power output | Efficiency at rated output | Efficiency at part load | ||
|---|---|---|---|---|---|
| kW | Average boiler-water temperature expressed in °C | Efficiency requirement expressed in % | Average boiler-water temperature expressed in °C | Efficiency requirement expressed in % | |
* Including condensing boilers using liquid fuels. | |||||
** Temperature of boiler water supply. | |||||
| Standard boilers | 4 to 400 | 70 | ≥84 + 2 log Pn | ≥50 | ≥80 + 3 log Pn |
| Low temperature boilersf1 | 4 to 400 | 70 | ≥87.5 + 1.5 log Pn | 40 | ≥87.5 + 1.5 log Pn |
| Gas condensing boilers | 4 to 400 | 70 | ≥91 + 1 log Pn | 30f2 | ≥97.1 + 1 log Pn |
Annotations
Footnotes
- f1
*
Including condensing boilers using liquid fuels.
- f2
**
Temperature of boiler water supply.