hi folks,
I'm buying a new build house in N.I that has an oil fired condensing boiler and a room sealed wood burning stove with a back boiler and both heat sources serve to supply a thermal store which in turn serves the central heating and DHW via internal coil heat exchangers. (The brand is maxi pod from N.I)
I'm a chippy by trade so am after some expert insight into why a thermal store (DHW supply) is rated as only 3 stars on a sap/EPC assessment.
The oil burner/wood burner combo gets 4 stars for the heating side which comes through the heat store too...
The only thing that I can guess at is the heat store also has an electric immersion element fitted and if that is only switched on to assist with the DHW demand then the more expensive electric energy required 'might' be the answer but I'd appreciate any insight from the experts.
Of the 2 other houses built at the same time with the same DHW systems one also gets a 3 but one gets a 4...
Any thoughts? (Apart from me getting a life)
I'm buying a new build house in N.I that has an oil fired condensing boiler and a room sealed wood burning stove with a back boiler and both heat sources serve to supply a thermal store which in turn serves the central heating and DHW via internal coil heat exchangers. (The brand is maxi pod from N.I)
I'm a chippy by trade so am after some expert insight into why a thermal store (DHW supply) is rated as only 3 stars on a sap/EPC assessment.
The oil burner/wood burner combo gets 4 stars for the heating side which comes through the heat store too...
The only thing that I can guess at is the heat store also has an electric immersion element fitted and if that is only switched on to assist with the DHW demand then the more expensive electric energy required 'might' be the answer but I'd appreciate any insight from the experts.
Of the 2 other houses built at the same time with the same DHW systems one also gets a 3 but one gets a 4...
Any thoughts? (Apart from me getting a life)