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Last seen: May 24, 2026
@cathoderay this is great news. I'm pleased we're getting somewhere. There's a noticeable step change in the power output starting with the 18:00 re...
Hello, Sounds like the flow goes through the magnetic filter before it gets to the PEX, so that's good. 22mm and 1.8m3/hr is about 1.3m/s. I thin...
A brief explanation of reading vendor pump curves. Here's a simple heating system. It's got 3 radiators, each one can be turned on or off separatel...
Something else crossed my mind when I posted on a discussion about the order components should installed. You mentioned you reversed the direction o...
Hello All,I'm conscious I've turned up on the forum and am writing these long posts full of apparent technical detail. I've been troubleshooting heat ...
Hello All, remember your designing a loop transferring liquid water. The pump just moves the liquid round in circles. It makes no difference to syst...
@cathoderay I'll put something together about pump curves and system curves. But to help you, I suggest the following: Open all the TRVs and locks...
Hello, I can explain all the pump curve information, but it will take a while for me to put some pictures together. For now, lets work on the basis t...
^Hey, look at that, it worked 🙂 OK, This is a pump curve. The top one shows Head against volumetric flow at different pump speeds. The chart show...
Hello again,I wonder what's going on here? The system seems to have landed at an equilibrium point. LWT = Set_LWT and the compressor has slowed do...
Hello,I'm not very good with using quotes from forum posts, so I'll try to use headings insted.How did I calculate the secondary flow rate?If you igno...
I found an install manual for an MD16IU-008DW unit. Can you find the value of dT1SH? It might be in "ServiceMan / 3. Heat mode settings" The manu...
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Latest Posts
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RE: Comms and power cabling to outside unit
@jamespa I can only guess the issue is with cost of ...
By Papahuhu , 37 minutes ago
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My 4 bed 1960's dormer bungalow has got a 6KW Mitsubish...
By Clockworks , 2 hours ago
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RE: Vaillant Arotherm Pro vs new Plus
when our system was installed in September 2 years ago ...
By Judith , 14 hours ago
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RE: Rate the quality of your heat pump design and installation
I had a Heat Geek lead install by Green Heat Norfolk. T...
By Orlando , 22 hours ago
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+1 that works well If most of the thermal mass is in ...
By bobflux , 1 day ago
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RE: Mitsubishi Ecodan FTC6 settings
While @F1p's dongles are great, the FTC can do this its...
By RobS , 2 days ago
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RE: Samsung heat pump - data cable issue
If it's a data cable, current will be minuscule, voltag...
By bobflux , 2 days ago
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RE: MCS Quality Audit – Has Anyone Had One? Did It Lead to Remediation?
I got hit with an RHI audit in 2022. It was far from c...
By Abernyte , 2 days ago
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RE: Electricity price predictions
@papahuhu Groucho Marx had something to say about no...
By Toodles , 2 days ago
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread
@jamespa haha very true, although the engineer yesterda...
By swwils , 2 days ago
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RE: What a difference a few degrees make.
Wow. Having accepted the challenge, I ran the cold tap ...
By Old_Scientist , 3 days ago
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RE: HeatPump maintenance in Swindon area?
@vince31 have you tried using our finder:/p>
By Mars , 3 days ago
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Looking for beta testers for a new homeowner heat pump tool
Over the past few months I've been building a brand new...
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