Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Vaillant Noise Redu...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Vaillant Noise Reduction effect

 
Air Source Heat Pumps (ASHPs)
Last Post by jeegnesh 2 years ago
3 Posts
2 Users
0 Reactions
1,994 Views
RSS
 jeegnesh
(@jeegnesh)
Estimable Member Member
Joined: 2 years ago
Posts: 100
Topic starter 11/02/2025 9:49 am   [#2095]

Curious if anyone has experimented incorrectly with the noise reduction feature, in terms of kw consumed

Does it use less kw consumption or does it balance itself out as the same?

Weird I know but am trying to keep my consumption numbers down whilst also having a comfortable home temp.


13.6kw Solar, 40kw Battery, 10kw Heat Pump and EV Cars


   
Quote
JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 5269
11/02/2025 11:56 am  

Posted by: @jeegnesh
↑

Curious if anyone has experimented incorrectly with the noise reduction feature, in terms of kw consumed

Does it use less kw consumption or does it balance itself out as the same?

Weird I know but am trying to keep my consumption numbers down whilst also having a comfortable home temp.

I think the fundamentals are this:

NR clamps performance at a particular level.  So most of the time it will make no difference.  When its cold enough that it does make a difference then yes it will reduce the energy consumption, but at the expense of the house cooling.  If NR is timed then the heat pump will have to work harder when the NR restrictions are removed, which may well cost more (its like a setback).  The easiest way to reduce energy consumption at the expense of the house cooling is to turn down the WC curve (and thus room temperature) a bit.

That said there may be some 'second order' effects, particularly with DHW.  Depending on the algorithms used which vary from manufacturer to manufacturer, NR might result in a less aggressive warm up cycle for DHW, which may well cost less at the expense of the space heating being off for longer and the reheat time being longer.  Some heat pumps have selectable DHW modes, which essentially moderate the aggression of the rehear, and NR may well achieve something similar to the 'eco' mode or whatever the manufacturer chooses to call it.

Best way to achieve lowest consumption (in most cases) is to operate with no external controls, at lowest WC consistent with keeping the house warm, and no buffer tank, LLH or PHE separating heat pump and emitters.  From that starting point tweaks may save a few percent, but rarely a lot unless the situation is one of the 'exceptions' (there always are exceptions!).  If you have a ToU tarrif lowest cost may be at a different operating point to this of course.

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
ReplyQuote
 jeegnesh
(@jeegnesh)
Estimable Member Member
Joined: 2 years ago
Posts: 100
Topic starter 11/02/2025 7:45 pm  

 

If I did a HW boost out of hours would it still run at eco, thats the only issue I see as it takes twice as long to heat up the tank. 

 

I don't know TBH but would guess so.


13.6kw Solar, 40kw Battery, 10kw Heat Pump and EV Cars


   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Members Online

Click to access the login or register cheese
Protected By
Shield Security PRO