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: Oct 16, 2025
@dgclimatecontrol Thanks... this was resolved back in March/April.
@davidnolan22 Hi..! We've only just turned on the heating again following the summer but it's not overly concerning right now. It's cycling a little b...
@gary The tank is 210 litres. I work from home as a baker so I can use a lot of water during the day but using the old MegaFlo and oil boiler, we neve...
Thanks James, this is still something on the to-do list. I know there's more diagnostics to be done. I was just hoping the new pump would stabilise th...
Thanks. I still need to check this out. It's taken all my mental capacity to wrap my head around the heat pump. So it should be as simple as just adju...
I haven’t looked at that side yet. But so far, the only thing that’s changed is that we’ve had the heat pump changed and COP is getting worse. I can s...
@jamespa It does appear to be going into defrost more frequently than the previous pump at similar temperatures. Would that account for the higher ene...
@jamespa Thankfully they didn’t touch the settings. They checked the pressure on the tank but that’s all.The only work they did was on the external un...
Just a follow up… first full day of the new heat pump… worst COP in weeks. COP down from a regular 3.4 to 3.8 to 2.7 yesterday (that’s just heating, n...
Just a bit of an update... thanks to the information you've shared with me, I was able to argue the case of the oversizing a little better.They revisi...
@jamespa Thanks James. The DHW COP is the worst we've had yet strangely. And there were no big drains on the water yesterday. It's like it's heating...
@jamespa Thanks for this.The COP for yesterday was 3.57 (heating 3.79 water 0.87) so the DHW eco setting might be making a difference but I'll keep mo...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
Thanks for sharing that. Your objective seems very sen...
By JamesPa , 2 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@toodles Very nice. Ours was the opposite, about 10%...
By Papahuhu , 3 hours ago
-
RE: Adding additional Solar Panels to a DC coupled battery system
A couple more points about placing solar panels at low ...
By Transparent , 3 hours ago
-
RE: How Accurate Is My DIY Heat Loss Calculation?
@kilgorexv definitely a larger inverter will help and m...
By AndrewJ , 1 day ago
-
RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 1 day ago
-
RE: Surface mount or bury primaries for heat pump installation?
The installation is almost done! I've written up two ...
By tomasmcguinness , 2 days ago
-
RE: Glass lined Cylinder for private water supply
This has turned into a fascinating little rabbit hole. ...
By Mars , 2 days ago
-
RE: Switch suitable to change between two inverter CT's
Last winter my battery ,32KWh, could run the house com...
By Jancold , 2 days ago
-
RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Agree with Major. And even if I was very happy with ...
By Batpred , 2 days ago
-
RE: Is the "divide by 2900" rule still valid?
There is another estimator that you could use, a formul...
By Rob of York , 2 days ago
-
RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
@penval, really useful update. After all the discussion...
By Mars , 4 days ago
-
RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 5 days ago
-
RE: Questions about A2A for heating as well as cooling
@rob-of-york I would concur with the underfloor insulat...
By Toodles , 6 days ago
-
RE: New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
Nothing attached! I have rads but UFH makes the case ...
By JamesPa , 6 days ago
SPONSORS
