ᐅ How often should the heating circuit be refilled in a new building with underfloor heating?
Created on: 18 Sep 2019 10:53
V
Vega82
Hello everyone,
how often nowadays does water need to be refilled in a new building (built in 2016) with underfloor heating?
We have a Viessmann gas boiler and about 140m² (1507 ft²) of heated area.
Currently, I need to refill water about once a year because the pressure drops from 1.5 bar to around 0.9 bar. The underfloor heating only runs about 7.5 of 12 months, and the rest of the time only hot water is produced.
In your experience, is this still within a normal range, or should I start to be concerned?
how often nowadays does water need to be refilled in a new building (built in 2016) with underfloor heating?
We have a Viessmann gas boiler and about 140m² (1507 ft²) of heated area.
Currently, I need to refill water about once a year because the pressure drops from 1.5 bar to around 0.9 bar. The underfloor heating only runs about 7.5 of 12 months, and the rest of the time only hot water is produced.
In your experience, is this still within a normal range, or should I start to be concerned?
M
Michlhausbauaa26 Sep 2019 14:01Heating circuit – it is a closed loop after all – just think about it yourself
The expansion vessel inside the unit has a Schrader valve, and pressure is probably lost through it. With a capacity of 12 liters (3.2 gallons), even a small loss of a few milliliters is noticeable. As far as I can tell, the vessel is airtight. Otherwise, everything in the boiler is dry and sealed.
The automatic air vent was slightly open, so some loss could have occurred there as well.
I have now added around 500 to 1000 milliliters (17 to 34 fluid ounces) and increased the pressure from 0.8 to 1.8 bar.
The automatic air vent was slightly open, so some loss could have occurred there as well.
I have now added around 500 to 1000 milliliters (17 to 34 fluid ounces) and increased the pressure from 0.8 to 1.8 bar.