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Hi I have been delving further into my heating system, and feel like I have made some decent setup/efficiency gains. Using an ems-esp setup I am getting some (to me) interesting data! One thing I have noticed is that when one ufh loop is open I am getting a bit of cycling, which is...

Thanks, yea they confirmed the same to me, so I am somewhat stuck as it stands, however with a timer on it I am definitely burning less gas! I think the tank itself will likely need replaced in the next few years given the heat loss, so happy to wait it out now I know what the issue is, and...

They both go into the same pocket, it seems one is for the stat and one for the thermal cut out. The stat in it is the BTS60109, and cotherm have confirmed it is very sensitive and doesn’t have much/any differential. Their other models have 5/8 degrees as standard.

Ye Yes, that’s what’s in it, I made a mistake on the model before.

Hi So unfortunately seems I had the wrong part number, as that was listed as a replacement for my tank, but the item in it is a BTS60109, the MD of cotherm confirmed this morning 'These are quite sensitive and have a tight tolerance (differential) which is designated by the system...

So cotherm have confirmed it’s basically 1 degree in that unit. Usually it’s 8-5 they said. So seems it’s just the thermostat causing this issue!

It does seem strange, as it means every 'baxi' cylinder is calling for heat more often than needed, i.e every time someone runs a tap to wash their hands...appreciate I may be affected more as I do think the tank itself is maybe feeling its age, but seems odd. I just am not sure if I can...

So I spoke to someone helpful at baxi earlier and they confirmed all their tanks are set to call for heat with even a 1degree drop….and that I should fit a timer. I think there is an issue with the tank losing heat, but given it’s not insane, and I have it under control with a timer that’s prob...

Yep, fair point, it seems like a strange placement to be honest... I will get a new thermostat, see where I stand and take it from there, thanks again for all your advice and help!

Ok, so I am definitely not seeing that given the heat loss I am seeing on the unit, so would suggest that issue 1 is the thermostat is up the left or has lost the ability to switch using the differential. Thankyou! Secondly, I isolated the hot water circuit, and am seeing the same heat loss as...

Yea, so the pipe on the left is the boiler hot flow, the pipe on the right is the cold inlet, and the grey box has the temp probe/thermostat etc. As you can see it’s not very far up…excuse my rough and ready insulation :) I have also bought a wee switchbot to turn off the HW cylinder during...

Thats great info, thankyou. So I am basically losing around triple what your 150L tank is losing in kWh and double in temp. The manual for the tank says that the standing heat loss for the 300L tank is 2.72kWh per day, so I am losing around 3x that based on the above. Just waiting for the tank...

Would they generally not have a differential or have it higher than that?

Ah the probe wasn’t inserted into anything before that, so that’s just the amident air temp. The flow of hot/cold was on during this time, so all was normal apart from the fact the cylinder had no power so couldn’t call for heat. I am going to do the same test today but with the hot flow...

Hi, yes it does appear to be that model! The average is just what the app the sensor is connected to shows, it’s not correct though as thats over 24hrs and the probe was only in for 6 hrs, so best ignored!

The graph is just from my own temp probe I popped in to the pocket to see what was happening, the actual stat is...

Yea, so I removed their temp probe today, turned the power off to the tank once it was up to temp and left it while I was out. Over almost 6hrs it lost 3.5 degrees, which given the thermostat pocket seems to be at the bottom of the tank, doesn’t seem too bad, so I am wondering if instead of the...

Hi The tank is a PP300B, the stat is built into it. There doesn’t appear to be any wiring centre for the tank itself, the cable goes downstairs, into a wiring centre for the whole system, where it links to the zone valve and pump. To be honest even getting involved in the wiring centre...

I have been checking it manually, usually around 25-30% modulation when the hot water is on

Hi, I have one coming for the flow today, but it’s definitely the cylinder firing it, the heating is off and it’s the hot water circuit coming on. It’s a greenstar8000 35kw system boiler, set to 65. Ta Paul