Last seen: Jan 7, 2026
@sheriff-fatman All data is the average of readings taken at 5 minute intervals over a period of about 2 hours during which the system was stable, e.g...
@sheriff-fatman New Year Greetings. Here is some of my data from over Christmas and New Year. I have been experimenting with flow rates, flow temperat...
@sheriff-fatman Thank you, food for thought. I think that I am about to be distracted by Christmas. Happy Christmas
@jamespa I appreciate the questioning, you are correct it is important to have certainty. How would you check what the pump thinks the power consumpt...
@sheriff-fatman You may be able to vary the pump speed by using the controls on the pump.
@jamespa The 2 pumps was a decision by the installer, I don't think that they are necessary but at the moment it is a small difference in energy consu...
@sheriff-fatman This is the table that I am familiar with. It shows a COP of 5.04 with a capacity of 4.1kW at 7C OAT and 35C flow. Which is why I thin...
@sheriff-fatman The FTC7 with third party cylinder and pump does not control the pump speed, there is a menu item for pump speed and the value can be...
@majordennisbloodnok Delat T 3C, no defrosting and I am not running Home Assistant
@sheriff-fatman I'm not sure why you have selected the Max figures from this table. Lower down the minimum figures are provided, these are more repres...
@f1p No Buffer, No LLH, Delta T is 3C, pumps are in proportional pressure mode, giving a fairly constant 19 l/min. There is glycol in the system and I...
@jamespa No cycling, flow temp varies by less than 2 degrees, return is very stable. Today it is running at 38C varying by less 2C, since water heatin...
Latest Posts
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RE: If a heat pump can only heat DHW to 50C then what? Issue with 18KW Heliotherm heat pump
Hi, Nothing yet. I've asked customer to measure flow...
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RE: High Temp Heat Pumps for fast warm-up of house
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By JamesPa , 7 hours ago
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RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump
OK. What Im seeing looks fairly normal TBH: 1 start ...
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RE: Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow
@editor thanks for the tips which I will try before cal...
By DavidB , 9 hours ago
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RE: Daikin 6kw setup with Dixell controller
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By CraigH , 9 hours ago
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RE: Exploring the role of alternative clean heating solutions - Government Consultation
Despite reservations, I found some time to respond to t...
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RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
@crankplus, nope, still not, and I've followed up with ...
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread
@agentgeorge Probably, but temperature change at -10 ha...
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RE: External wall insulation - your experience
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@foxesfan Re: ‘Servicing’ as @editor has covered in his...
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RE: A Smarter Smart Controller from Homely?
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RE: Battery sizing - How low can you go!
It seems I am seeing something similar to what you do, ...
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RE: Gaslighting in the heat pump industry – has anyone else experienced this?
Don’t know if this is relevant to this thread, but my A...
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RE: Bosch CS5800i 5kW - Experience So Far
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RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey
Since May 2025 it no longer a requirement in England to...
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RE: Air source heat pump roll call – what heat pump brand and model do you have?
Forum Handel @jancold Manufacturer: Daikin Model: E...
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RE: Octopus Cosy 12 Heat Pump Regret: Incredibly Loud, Poor Heating & Constant Hum - Help!
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RE: Hoped for improvements not being realised on my Mitsubishi heat pump
I have been wondering that myself. The fact is that, ...
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RE: Filtering Tap Water – Share Your Setup for Cleaner, Better-Tasting Water
I remember when I was in my early 20s I was introduced ...
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RE: Setback savings - fact or fiction?
But if it is recorded an an integer, which it seems it ...
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