Guidance

CHPQA guidance note 17: Uncertainty in metered inputs and outputs

Guidance on assigning uncertainties to metered values of energy inputs and outputs, and taking account of them in determining the power and heat efficiencies of a scheme.

• From: Department for Energy Security and Net Zero
• Published: 1 September 2021
• Last updated: 26 March 2026
  Show all updates

  1. 26 March 2026

     Updated 2026 to align with the CHPQA Portal now hosted on GOV.UK.

  2. 1 September 2021

     First published.

Documents

CHPQA guidance note 17: Uncertainty in metered inputs and outputs

PDF, 268 KB, 17 pages

Details

Guidance on assigning uncertainties to metered values of energy inputs and outputs, and taking account of them in determining the power and heat efficiencies of a combined heat and power scheme.

This guidance note also contains a general simplified method for determining the overall uncertainties in flow meters.