Here’s a quick analysis of running costs for 18 heatpumps listed, ordered by descending SCOP, vs the equivalent cost for a 90% efficient gas boiler (red line), using current the Energy Price Guarantee (as set by UK Government). Analysis may not translate to other countries.
The three darker bars are systems with a complete set of data for the whole year, others are not.
Four paler bars have less than 30 days worth of data, and may change over the year.
Majority of these heatpumps are proving to be cheaper to run than an equivalent gas system.
System #18 is clearly an outlier, and does not perform as well as we’d expect for a heatpump.
Caveat: this is a very small sample, and is heavily skewed towards heatpump owners who have invested in getting good performance from their systems.
The actual running costs will depend on the particular tariff that each homeowner is using, and may be offset by solar PV or other renewable technologies.