The EPC tool produced by Elmhurst @consultancy_elm and others makes no provision for larger properties using cascade heat pumps for larger properties. In fact, it only allows for very basic system specn.(such Air to Water, Air to Air, etc.). @BRE_Group 1/
Contrasting with gas boilers, where it allows the surveyor to specify the precise model being used on the SAP database.
It results in ludicrously high bill estimates for larger properties, because they are still assuming you are only using one heat pump that can’t cope. 2/
It results in ludicrously high bill estimates for larger properties, because they are still assuming you are only using one heat pump that can’t cope. 2/
Hence the energy demand can’t be met a single heat pump and the flawed 'algorithm' appears to assume that the rest is delivered by direct electricity at a SCOP of 1:1. Instead of the reality (bills coming down) it massively inflates the projected running costs. 3/
When will this be fixed Lord Callanan? @MartinCallanan @CommonsBEIS - we need to decarbonise heating and a flawed EPC is a blocker to that. 4/4
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