18 November 2025
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Rinnai’s Seasonal Performance Factors and Heat Pump Design CPD details the potential limitations of manufacturer-issued efficiency measures for Heat pumps, namely COP (Coefficient of Performance) and SCOP (Seasonal Coefficient of Performance). Manufacturers often measure heat pump efficiency using Coefficient of Performance (COP), which is the ratio of useful heat energy produced to the electricity consumed at a specific external air temperature.
A SCOP efficiency rating solely measures the heat pump unit which may yield a lack of system congruity when considering the entire system. Consequently, relying on this performance measurement alone can affect customer expectations in system performance and carbon reductions.
Rinnai offer an alternative methodology in measuring system efficiency; a Seasonal Performance Factor approach evaluates all energy utilizing components within a commercial hot water system and measures the performance of the entire system, as opposed to solely the heat pump.
By presenting this CPD to UK customers, contractors, consultants, specifiers and installers, Rinnai aims to provide information that delivers a concise and true account of commercial hot water heating performance using the ‘Seasonal Performance Factor’ methodology.
Rinnai UK’s new division - Rinnai Applied has multiple bursaries available and to qualify you must be fully eligible and successfully complete the three CPD sessions between now and March 2026.
The CPDs are on the following subjects:
- Seasonal Performance Factors (SPF) and Heat Pump Design
- Introduction to Water Neutrality
- Retrofitting Heat Pumps into the Leisure Sector through CCA & SPF Analysis
Rinnai continues to inform the UK market of system operating details that provide an accurate statement of performance, while considering the effects on operational expenditure, economic investment, and environmental impact.
