Combi Boiler Hot Water Temperature Fluctuates

One solution is to turn down the required temperature of the water.

Combi boiler hot water temperature fluctuates. Status not open for further replies. For combi boilers the recommended output temperature for the radiators is 75 c and for the water it s 60 c. This will stop the boiler overheating the water. It may as well have been the cold tap.

Most modern boilers will have a digital dial that allows you to set the output temperature. These thermostats usually require two aas. The boiler shows just over 1 bar and the flow of water to hot and cold taps seems good. Went back to the boiler it s just a tad under 1 bar which is where it stayed went back to the bathroom and basically the water kept alternating between warm cold not hot cold but warm cold.

Go back to the bath stick my hand back under the water it s cold. You shouldn t need to adjust these output temperatures as you may alter the boiler s efficiency. The boiler is heating the water then the water leaving the boiler gets too hot so the boiler shuts down until water leaving the boiler is cool again and then cycles. Hot water heaters can provide water as high as 140 degrees.

Doctors recommend setting your heater at 120 or below to avoid dry skin. The fluctuating temperature happens at all taps eg kitchen tap bathroom sink tap bath tap and even when the taps are only half on. If your hot water is working but your radiators aren t getting hot despite the thermostat telling you the heating is on check the thermostat is not flashing up with a battery symbol or displaying a flashing light on the receiver unit at the boiler. Dec 6 2010 1 i have an issue with a plumbed in mains pressure mixer shower.

When running the shower the boiler will cycle to a very nice warm temperature around 56degc and then switches.