Boiler Flow Temperature Set Incorrectly
High gas bills, radiators that are scalding to touch, or a condensing boiler that never actually condenses..
High gas bills, radiators that are scalding to touch, or a condensing boiler that never actually condenses.
What is actually going on
High gas bills, radiators that are scalding to touch, or a condensing boiler that never actually condenses.
The realistic causes, in order
A flow temperature left at the factory maximum after installation A system where radiators are undersized, forcing a high flow temperature to compensate Weather compensation available on the boiler but never enabled or set up
What we test on site
Current flow temperature and return temperature under real load Whether the return is below the dew point needed for condensing operation Radiator output against room heat loss, before recommending any reduction
What you can safely look at with a boiler running at the wrong flow temperature
- Note the flow temperature setting shown on the boiler
- Check whether radiators are too hot to hold your hand on
- Reducing flow temperature saves gas only when the emitters can still meet the heat loss. Doing it blind can leave rooms cold and is why we measure first.
Who does the work
- Gas Safe registered engineers — registration 554328
- Worcester Bosch accredited installer
- John The Plumb Ltd, company registration 10026483
Get a boiler running at the wrong flow temperature diagnosed properly
Where the radiators allow it, a corrected flow temperature is one of the few genuinely free efficiency improvements available.
Questions we get asked
Is a boiler running at the wrong flow temperature a controls fault or a boiler fault?
A flow temperature left at the factory maximum after installation
What normally puts a boiler running at the wrong flow temperature right?
Where the radiators allow it, a corrected flow temperature is one of the few genuinely free efficiency improvements available.
Is it safe to keep using the system with a boiler running at the wrong flow temperature?
Reducing flow temperature saves gas only when the emitters can still meet the heat loss. Doing it blind can leave rooms cold and is why we measure first.