AS Heat Pump Compatibility with Zoned Drayton Wiser System

16 Oct 2023
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United Kingdom
We're in the process of trying to get an ASHP system installed to replace the old oil boiler that met its maker back in May.

Old setup was a Boulter Camry 5 boiler in a standard s-plan system, controller by Drayton Wiser with individual smart valves on every rad.

The company we're working with has proposed a 11.4kW Daikin setup, but have said that the Drayton system would have to go and be replaced with a single Daikin control/thermostat unit.

Initially, he just said that the Drayton system was just designed for oil boilers (even though it has an ASHP mode), but when pressed, he said it was because the zoning system of Wiser would shut off the rads and leave a smaller cycling volume, whereas the heat pump needed to pump around a large volume to work properly. He then said that we'd need to go back to standard TRVs. Which seems like a total nonsense to me, as standard TRVs will also shut off the flow, thereby reducing the cycling volume.

Can anyone shed any more light on whether this is legit, and if there are any good reasons for not using Wiser?

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I've not done any ashp training, but maybe contact Drayton?

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