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ASHP flow through pipes is noisy and preventing us from using at night......looking for help.

DannyMoss23 · 2024-01-10T10:42:28Z

Hi, I'm hoping to get some help, advice or just common experiences......we're really struggling with the noise from the flow pipes. Not with expansion and knocking - we did have some of that but the installers have come back to secure the pipes and add foam to stop any rubbing on the floorboards and jousts. The noise we are struggling with is the actual noise from the flow coming from the ASHP to the cylinder and back again. Some scene setting: We had our Ecodan R32 11W ASHP installed in late October, after the original design had the heat pump on the exterior wall outside the bathroom, chosen by the sales guy as the shortest route to the cylinder - which is housed in our old airing cupboard in the 1st floor bathroom. But once the technical pre fit team came around they said it couldn't go there as it was too close to the neighbours planned extension, so we decided to house it behind the garage on the opposite side of the house and run the flow pipes under the 1st floor floorboards across to the bathroom - where the cylinder still lives. I should at this stage point out that we were replacing a gas powered air blown heating system from the 70's, so no boiler, no radiators and no pipework. Just a massive gas blown system in the kitchen and lots of air ducts leading up to the loft or down in the floor and then to vents in the rooms, horrible inefficient system that had to go. So the install went ahead and the guys fitting it used several miles of copper pipes - more than they thought they needed (at no extra cost I ensured) and managed to get it all in during the week. And the system is in, works great from a heating point of view, I'm getting around 3.5 COP and the massive rads we needed are able to heat the house. The pump is working very hard on the cold days and I'm spending more than £10 per day whilst it's less than 5 degrees which I'd like to optimise over time. But the problem I have is that we can't run it at night because of the noise of the flow coming through the bedroom from the garage. I think the noise may be getting caught in the cavity in the exterior wall as the noise is most prevalent behind the headboard inside the wall. I've turned our pumps on the pipes down to the lowest setting to reduce the noise but they are still running at 21. Has anyone had any similar issues or have some suggestions to reduce the noise? Hopefully my ramblings made sense, I'll do my best to clarify any points if not! Thank you in advance.

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Air Source Heat Pumps (ASHPs)

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iancalderbank

(@iancalderbank)

Prominent Member Contributor

Joined: 4 years ago

Posts: 643

12/01/2024 12:20 pm

@dannymoss23 its not that exciting... you can't not have one ! they're absolutely standard required items , your system wouldn't work at all without one, it'd be airlocked all the time.

whats optional, but more interesting and beneficial to long term noise reduction is an air separator as per my 2nd pic. I doubt you've got one. fitting one would be a likely next step if putting insulation around the pipes doesn't help (or not as much as you want it to). they're about £100 to buy, easy job to fit if there's a suitable length of pipe it can go on (should be one around your cylinder). there might be an economy on your fitters time to have them do it at the same time as the other stuff.

My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
11.9kWp of PV
41kWh of Battery storage (3x Powerwall 2)
2x BEVs

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DannyMoss23

(@dannymoss23)

Eminent Member Member

Joined: 3 years ago

Posts: 26

Topic starter 12/01/2024 12:24 pm

No separators though ☹️

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Mars

(@editor)

Illustrious Member Admin

Joined: 6 years ago

Posts: 4958

21/11/2024 9:32 pm

@dannymoss23 we're well into winter now. Did you resolve your noise issues?

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DannyMoss23

(@dannymoss23)

Eminent Member Member

Joined: 3 years ago

Posts: 26

Topic starter 23/11/2024 3:20 pm

Hey @editor, yeah thanks for asking. The installers were good actually once I managed to get a response. They filled the cavity and put insulation around the pipe and it’s tonnes better now.

system working well and toasty in the cold months.

we’ve settled on the pumps at the lowest level in the summer but once it gets colder I bump it to level 2 to make sure the radiators furthest away from the cylinder are getting hot

👍

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