How noisy is your heat pump
On the back of BridgetJohns post, it would be good to hear from ecodan owners how loud your heat pump is. The outdoor heat pump itself is pretty quiet but when it’s operation the internal pumps are pretty noisy with high pitch humming sound. Have learned to sleep through it now but I do wonder if flow rate is set too high and it’s not supposed to sound like this
Well I've got an Ecodan. The heat pump outside is really quiet, but even so I can't even hear any internal pumps in action.
105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs
"Semper in excretia; sumus solum profundum variat"
We have an 11.2kW Ecodan. I noticed that the compressor was notably louder at lower ambient temperatures, eg approaching and below 0degC, due to the compressor being required to work harder.
I made some enquiries about the "Quiet Mode" option in the controller. Apparently on Ecodans it simply limits the compressor speed to reduce maximum noise output. Obviously this also reduces the maximum capacity of the heat pump.
As our heat pump has been conservatively sized, I decided to trial the unit set to full time Quiet Mode. So far it has operated fine when set on the quietest option, including when we had sub-zero temps for a few days in January. The unit is noticeably quieter now too.
Mitsubishi Ecodan 11.2kW R32 ASHP; Ecodan DHW cylinder; UFH+rads
20x430W Jinko TOPCON Tiger Neo solar; Luxpower 6+4kW hybrid inverter; 20kWh LFP battery storage
Posted by: @skdWe have an 11.2kW Ecodan. I noticed that the compressor was notably louder at lower ambient temperatures, eg approaching and below 0degC, due to the compressor being required to work harder.
I made some enquiries about the "Quiet Mode" option in the controller. Apparently on Ecodans it simply limits the compressor speed to reduce maximum noise output. Obviously this also reduces the maximum capacity of the heat pump.
As our heat pump has been conservatively sized, I decided to trial the unit set to full time Quiet Mode. So far it has operated fine when set on the quietest option, including when we had sub-zero temps for a few days in January. The unit is noticeably quieter now too.
Just to add, our DHW cylinder is also Ecodan. The three pumps were supplied by Mitsubishi as part of the pre-plumbed package. They all have a slight hum when operating but none are intrusive...even with the radiator circuit pump set to max flow.
Mitsubishi Ecodan 11.2kW R32 ASHP; Ecodan DHW cylinder; UFH+rads
20x430W Jinko TOPCON Tiger Neo solar; Luxpower 6+4kW hybrid inverter; 20kWh LFP battery storage
We also have an 11.2kW Ecodan. Generally very quiet except when the ambient drops. We only have one internal pump (something I am still trying to get rectified by our installer) and it does make quite a bit more noise than I would like, although I have also learned to sleep through it!
I wish we had had the opportunity to have the pre-plumbed Ecodan cylinder installed, but I don't think it would have fitted into our airing cupboard.
All decent heat pumps are variable speed, the outdoor units are quiet on warm days and noisiest when it's cold and wet. Indoors they should be pretty much silent.
The water pumps are very quiet when running. If you can heat them either there is air mixed in the water, you will hear noises like a tap running. It's super hard to get the air out. I would install a spirotech deaerator if you have this issue.
If you have water flowing noise in your radiators your system needs balancing. Balancing is easy but rarely done anymore. It's very important with high water speed heating like heat pumps.
Sounds like you need to call the installer back for a mid season tweak.
Good luck.
Heat pump builder
It is a very loud humming noise, which is louder when water is heating. No radiator s, all underfloor heating.
that is not good, you need the installer back. i have 4 pumps on my heat pump all in the same cupboard, i cant heat mine, there is something wrong with your system.
Heat pump builder
- 26 Forums
- 2,131 Topics
- 46.8 K Posts
- 64 Online
- 5,656 Members
Podcast Picks
Latest Posts
-
RE: Heat Pump Servicing & Maintenance – Good Value or Rip-Off?
@heat-pump-newbie as I suspected. I measure/monitor my ...
By Old_Scientist , 14 hours ago
-
RE: Say hello and introduce yourself
Whilst you're busy installing services (pipes and wires...
By Transparent , 18 hours ago
-
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
@editor I know it was formally announced at Ish the oth...
By PatrickVito , 2 days ago
-
@moman0311 welcome to the forums. I've received your em...
By Mars , 2 days ago
-
RE: Anyone still weathering it out with Agile?
Yes, but now try finding a working phone box….
By Majordennisbloodnok , 3 days ago
-
RE: Thermostat for Ideal Logic Air with 3 zone support
No harm at all in plumbing it as 3 zones, I would have ...
By JamesPa , 3 days ago
-
RE: ASHP heat output monitoring
@carlo I see there is a discussion in Facebook user gro...
By Tim441 , 3 days ago
-
RE: Flexi-Orb Heat Pump Scheme: A Game-Changer for the UK's Heat Pump Industry
MCS have set a potential trap in the new version of MCS...
By JamesPa , 4 days ago
-
RE: Who has a V2G EV installation
General comment on battery care... I guess if ev is on ...
By Tim441 , 5 days ago
-
@old_scientist like for like comparisons are almost imp...
By Tim441 , 5 days ago
-
RE: Who's your electricity provider and what's your tariff?
@old_scientist There is an option in the Tesla app that...
By Toodles , 5 days ago
-
RE: Mitsu Wireless Controller and MelCloud
On the FTC5 I think this requires the dip switch on the...
By Abernyte , 5 days ago
-
RE: Octopus Cosy & Octopus EV + bidirectional smart tariff, together. What, eh?
@old_scientist me too. Just installed my new heat pump ...
By Eliuccio , 7 days ago
-
RE: Is your heat pump insured?
Yup just spoke to Privilege to inform them of my impend...
By Scalextrix , 7 days ago
-
RE: Forum updates, announcements & issues
Just to keep everyone in the loop, as the site continue...
By Mars , 7 days ago
-
RE: Fast DHW setting on Midea (Clivet) heat pump
@simon-w, is this something you could potentially assis...
By Mars , 1 week ago
-
RE: Share Your Experiences with Heat Pump Manufacturer Support
Fwiw I called my installer out for the first time a few...
By JamesPa , 1 week ago
-
RE: Long term efficiency degradation
@jamespa yes as I thought thanks. We have a reaso...
By Scalextrix , 1 week ago
-
RE: Sunamp Thermino Heat Battery
@jamespa A few days after the installation had been com...
By Toodles , 1 week ago
-
RE: Planning Permission May 2025
Fair enough. I have read the legislation and MCS020a ...
By JamesPa , 2 weeks ago