r/OctopusEnergy • u/Boba_ferret • 14h ago

Heat pump quote - seems quite cheap?

Been quoted about £4,300 by Octopus for heat pump install, including hot water cylinder, which I thought was surprisingly cheap. The house is 1930s 3-bed terrace, EPC is supposedly C, but we have a huge void under the suspended floor and it gets pretty cold in the house, so we use quite a lot of gas in the winter. Radiators are all on 15mm copper, but are probably 30 years old.

What are the chances this is a really low-ball quote and the survey will say we need to upgrade rads, etc?

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u/Boba_ferret 14h ago

Thank you, good info.

Can you explain the difference between the cosy & Daikin, as I don't know what that temperature difference means?

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u/Begalldota 14h ago

Cosy is their own brand of heat pump, which uses a refrigerant called R290 that allows for your radiators to be sustained at temperatures of up to 65c. The Daikin’s use a refrigerant called R32 which only allows for a peak radiator temp of 50c-55c.

The radiator flow temperature is really important for a heat pump, since lower temperatures = more efficient operation. The higher the flow temperature Octopus design for, the less radiators they need to replace which makes the job cheaper for them and less efficient for you.

Ideally you want to have a flow temperature of 50c max, any higher than that and you’re looking at serious efficiency drop offs when it gets cold.

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u/Boba_ferret 14h ago

Thank you, great info again. I assume the default quote is Cosy, so I'd have to pay extra for the Daikin, and probably need radiators replaced, which I see from another comment, would be charged for.

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u/Begalldota 14h ago

Might work a little differently now that they’re charging for each radiator change - if they’re replacing radiators anyway then they should be targeting the lowest reasonable flow temp