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Boiler water temp
Comments
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My boiler changes the water temperature by itself.
When they first come on in the morning the radiators are so hot as to be almost untouchable but as the day goes on the water temperature has decreased when next the heating cycles on.
I reduced the temperature for a week but the boiler was on longer, up to an hour longer, in the morning until the thermostat temperature was reached.
After noting my usage every day for that week and comparing it to the previous week, and even the same week in previous years, there was not any noticeable reduction in gas usage, average about 55kWh a day, I just put the knob back to the position that the plumber had set it to when the boiler was installed and let the boiler and its controls take care of the temperature of the house.
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david1946 said:My boiler changes the water temperature by itself.
When they first come on in the morning the radiators are so hot as to be almost untouchable but as the day goes on the water temperature has decreased when next the heating cycles on.
david1946 said:
After noting my usage every day for that week and comparing it to the previous week, and even the same week in previous years, there was not any noticeable reduction in gas usage, average about 55kWh a day,
Typically you would be expecting to see under 10% improvement & if you have weather compensating controls already much, much less than that - after all that is what they are there for.0 -
Northern_Wanderer said:Verdigris said:
Measure it. You can get an electronic thermometer for a couple of quid. Tape the thermocouple to each pipe, near the boiler, in turn and see what the differnece is.
Thanks, I will check those thermometers out.
I ordered a couple of these last year to measure our flow and return temperatures after we had a new oil boiler fitted :
https://uk.rs-online.com/web/p/dial-thermometers/4315621
There may be cheaper ones out there on Amazon and eBay, but Brannan seemed to be a reputable brand and I didn't want thermometers that needed batteries. Claimed best accuracy is +/- 4 C which I was happy with as I wanted to get our return temperature down to 40 C which is well below the 54C point at which condensing boilers can condense.
After a bit of fiddling around with the boiler thermostat, the circulation pump speed and the radiator balancing valves, I have managed to get the boiler to run with a flow of 60C and a return of 40C for most of the time. It does vary but maintains the 60/40 when running the central heating which is when it uses the greatest amount of oil and runs for the longest periods.
Being an oil boiler, it doesn't modulate the boiler temperature and hasn't got any load/weather compensation logic built into the system.
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Excuse my ignorance I have hot water and heating temperature dials should both be on 500
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david1946 said:
I just put the knob back to the position that the plumber had set it to when the boiler was installed and let the boiler and its controls take care of the temperature of the house.
I wouldn't put too much credance in what the installer set it to. I suspect they set it high to ensure the customer isn't disappointed or thinks the boiler isn't powerful enough, resulting in call-backs0 -
FWIW, from the instruction manual for my boiler:The boiler heating control sets the maximum flow temp; the system decides what actual flow temps are required at any given time. The boiler is >13 years old, so not necessarily 'state of the art'?0
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worrywart_3 said:Excuse my ignorance I have hot water and heating temperature dials should both be on 501
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SJMALBA said:FWIW, from the instruction manual for my boiler:The boiler heating control sets the maximum flow temp; the system decides what actual flow temps are required at any given time. The boiler is >13 years old, so not necessarily 'state of the art'?PS. Nowhere in the post above does the manual suggest variable flow temperatures. This only happens automatically when a boiler is connected to a weather compensation or an Opentherm device.1
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I was referencing both the 'Heating economically' & 'Tips on Energy Saving' sections of the screenshot from the manual - the text display programmer (TD200) on my boiler shows 'requested flow temp' and 'actual flow temp' - as far as I can tell, the former changes as necessary up to the maximum allowed by the bolier heating control? It is used in connection with a room thermostat (RT10), so, as mentioned, the system decides... I think?Am I correct to follow the tips on energy saving in the manual, and have the boiler heating control set at the 'normal' maximum of 6 (max. flow temp of 75C)?0
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SJMALBA said:on my boiler shows 'requested flow temp' and 'actual flow temp' - as far as I can tell, the former changes as necessary up to the maximum allowed by the bolier heating control?
My boiler heats the heating hot water up to about 5°C above the set flow temperature before turning the burners off.0
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