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!
Last seen: Aug 18, 2026
Just to say you do need a firm tap (occasionally several), just opposite the inlet to the radiator. Hit it about as hard as you dare. Sometimes this...
So deltaT across rad circuit = 37.9-24.4 = 13.5C. ~5C is what we are looking for. So Im expecting the return from rads to be more like 32C than 24...
Yes. If the pin feels sprung then no problem. If it moves freely then the closing piece (not sure what it's called) may be stuck. A few sharp taps ...
You adjust the end points of the sloped line.you presented earlier. This will be somewhere in the menu, probably the installer menu. I would reduce ...
Yes thanks, good plot Yes initially, but then you turn down the weather compensation curve until the house is at just the right temperature, that...
Situation normal then as @tim441 says you are almost certainly going to have to meddle if you want your system to work efficiently. T...
Black thing looks like (probably) a low loss header combining the output of the two pumps. You will get complete mixing in that which could in princi...
On the grounds that turning the pump speed down didnt help I would put it back up again. Slow flow = higher deltaT across radiators = higher FT neede...
Quite likely not but...with two pumps you have the opportunity to get a very good turndown/modulation ratio and a level of redundancy against failure....
Sorry thats lots of numbers, but no clear explanation what they are measuring. What is needed is the temperatures of flow to and return from the rad...
That's correct. You probably will need to measure flow rate though, spec sheet will likely just be a pump curve.
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
Our Vaillant boiler was working with weather comp, but ...
By Batpred , 7 minutes ago
-
RE: Mitsubishi Ecodan FTC6 settings
The Mitsi remote thermostat should not be plugged into ...
By F1p , 23 minutes ago
-
RE: Do I add Air Con or MVHR to existing A2W ASHP?
@lizzie Thank you, very interesting and useful informat...
By Toodles , 4 hours ago
-
RE: PV and battery long payback - sense check query
@jamespa I was just commenting on the speed, not sug...
By Batpred , 7 hours ago
-
Readers here please note that Derril Water and many oth...
By Transparent , 8 hours ago
-
RE: Is it the house or the equipment?
- Comfort and silence (for heating) - Heat storage wi...
By bobflux , 8 hours ago
-
RE: Advice on Vaillant Sensocomfort
Oops, I meant Sensocomfort (the UI to the controls)
By Batpred , 8 hours ago
-
RE: Heat Pump Training vs. Real-World Installation
Our instal was very much the opposite. White haired blo...
By Batpred , 8 hours ago
-
RE: Flushing system, cleaning and inhibitor
While skim reading a manual for our Vaillant HW tank, I...
By Batpred , 9 hours ago
-
Of course, what do you expect, human beings are human b...
By JamesPa , 10 hours ago
-
RE: 'Chinese Diesel Heater' to heat the home .....
Old thread but I'm new to the forum so new to me. How...
By BlizzardGreen , 1 day ago
-
I'm not sure why you would want to make it more difficu...
By JamesPa , 1 day ago
-
RE: Wood burner with ASHP - direct air?
@lucia FWIW installed a woodburner some years ago. ...
By JamesPa , 1 day ago
SPONSORS
