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Hoping for a bit of advice, as I feel I am being fobbed off.
I have had 5 new radiators fitted to replace existing standard ones, three of which are none standard design, classed as 'designer radiators'. These were purchased to fit in with a new kitchen and was a fair price each. I am struggling with them, all designer radiators take ages to warm up, far longer than the towel rail or the other standard radiators, with one never getting up to temp even when all flow directed to it and left for an hour. I purchased an infrared thermometer to try and work out what is happening.
The worst, when tested after an hour of calling for heat, had a flow pipe water temp reading of 56°C but the bottom of the 1st bar was only 39.6°c the 2nd to 5th was 50°C (give or take) and the 6th-9th bars dropped to 40°C. Another again takes over an hour to warm up, even when full flow directed to it. This one was reading 57°C in on the flow pipe but 44.9°C on the 3rd tube.
I have bleed and balance the system. All non designer radiators now have return valves only partially open, to limit flow whilst still providing heat, the three designer rads have flow and return valves at nearly full open. Even with TRV heads removed, there has been no change in performance.
After multiple discussions with the suppliers, and providing evidence of the hot water flow up to and through the radiators, they have suddenly said my boiler pressure is too low. Surprisingly and suddenly, after I had told them my system pressure is two bars, these radiators need 3 bars to operate and they have asked me to 'try changing my boiler' (This was after asking me to swap radiators around). This system pressure information was not on the sales information or in the installation instructions. This sounds a bit 'too convenient' for me but I am not a heating systems engineer.
I can under stand a low pressure, say less than 0.5 bar, could affect the system performance but as the boiler is meant to work in this the pressure range, as it is set, is a 2 bar pressure and flow thats was suffice for the same quantity or radiators really the issue?
or am I being fobbed off and its a bunch of badly built radiators with poor through flow?
If interested, here are the videos of what I sent re hot water flow, which I sent along with the system pressure info and the fact I have balanced and bleed the system, to which I got the change your boiler response.
Thanks in advance
Jon
I have had 5 new radiators fitted to replace existing standard ones, three of which are none standard design, classed as 'designer radiators'. These were purchased to fit in with a new kitchen and was a fair price each. I am struggling with them, all designer radiators take ages to warm up, far longer than the towel rail or the other standard radiators, with one never getting up to temp even when all flow directed to it and left for an hour. I purchased an infrared thermometer to try and work out what is happening.
The worst, when tested after an hour of calling for heat, had a flow pipe water temp reading of 56°C but the bottom of the 1st bar was only 39.6°c the 2nd to 5th was 50°C (give or take) and the 6th-9th bars dropped to 40°C. Another again takes over an hour to warm up, even when full flow directed to it. This one was reading 57°C in on the flow pipe but 44.9°C on the 3rd tube.
I have bleed and balance the system. All non designer radiators now have return valves only partially open, to limit flow whilst still providing heat, the three designer rads have flow and return valves at nearly full open. Even with TRV heads removed, there has been no change in performance.
After multiple discussions with the suppliers, and providing evidence of the hot water flow up to and through the radiators, they have suddenly said my boiler pressure is too low. Surprisingly and suddenly, after I had told them my system pressure is two bars, these radiators need 3 bars to operate and they have asked me to 'try changing my boiler' (This was after asking me to swap radiators around). This system pressure information was not on the sales information or in the installation instructions. This sounds a bit 'too convenient' for me but I am not a heating systems engineer.
I can under stand a low pressure, say less than 0.5 bar, could affect the system performance but as the boiler is meant to work in this the pressure range, as it is set, is a 2 bar pressure and flow thats was suffice for the same quantity or radiators really the issue?
or am I being fobbed off and its a bunch of badly built radiators with poor through flow?
If interested, here are the videos of what I sent re hot water flow, which I sent along with the system pressure info and the fact I have balanced and bleed the system, to which I got the change your boiler response.
Thanks in advance
Jon