Heating / hot water / underfloor heating issue

Rudie · 8 Jan 2026

Hi all

Moved into a 4 bed property where we have a 35kw system boiler that has a hot water tank which is controlled by a hive controller.
Also have a manifold which serves 2 zones one for kitchen and one for utility.

The schedules are all separate , no overlaps.
Thing is when we use the heating along side the hot water schedule, the radiators don’t warm up as much as they would when they running by themselves.

Same with underfloor heating.

Is this the case with all systems like this? Or is something not quite right?

Thanks in advance.

Rudie · 8 Jan 2026

Forgot to say the underfloor heating is controlled by a heatmeiser controller.

CountryFan · 8 Jan 2026

35Kw seems massively oversized! Wonder if it’s been range rated? What motorised valves are in play?

Rudie · Friday at 12:48 PM

Hi yes Looks like I got 3 Honeywell home motorised valves.

Rudie · Sunday at 1:35 PM

Is 3 motorised valves ok? When the hot water comes on or heating I can hear the valve whirring. There are some visible levers on each that I haven’t seen move

CountryFan · Sunday at 3:17 PM

Rudie said:
Is 3 motorised valves ok?

Yes, perfectly fine

Rudie said:
When the hot water comes on or heating I can hear the valve whirring. There are some visible levers on each that I haven’t seen move

You can't always see them move and they don't always move

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Heating / hot water / underfloor heating issue

Rudie

Rudie

CountryFan

Rudie

Rudie

CountryFan

DIYnot Local

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