this post was submitted on 31 May 2026
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There's plenty of reasons for that to happen, but it depends a lot on how your heat source works.
Most regular furnaces will heat up the water quite high, and just leave it at that temperature, and as soon as the water temperature is about to drop, it starts heating again, therefore the temperature rarely changes, unless you have used up all the hot water (teenagers running long and hot showers for rather long, or just many people showering in short succession).
But many newer smart furnaces, and especially heatpumps will change the amount of hot water available depending on demand, and even dynamic electricity costs.
I have a modern heatpump which both controls the temperature and amount of hot water depending on usage patterns, as well at optimizing for heating up the water when the electricity is cheap. Just today electricity is 5x as expensive at 20:45 as it was at 15:00
This means that the hot water temperature and volume can change quite significantly, depending on the time of day and the electricity cost.
Right now I can see that my hot water is only 45.7°C/114.1°F, which fits well because no one in the house is usually showering at this time, and the hot water is only used for washing up and washing hands.
In the morning the hot water tank will likely be around 55-60°C/131-140°F, because that's when people are usually showering, and the electricity is usually cheaper during the night hours.
Having a thermostatic mixer that can be set to a fixed temperature, regardless of the input hot water temperature is quite nice in this case.
Where I live it’s against building code for hot water to be kept below 60C, due to the potential for growth of water-borne pathogens. A hot water tank that allows water to fall to 45C would not be allowed. In practice, the companies who supply water heaters set them much higher than 60C to avoid the risk of water cooling below that temperature during extended power outages.
I don't know what specific pathogens you are talking about, but the classic risk is Legionella, which gets killed at only 55°C.
The heatpump is aware of this, and has built in additional electric heaters, and combine the electric heaters with the regular heatpump cycle to heat the water up to temperatures beyond 60°C regularly to keep the water pathogen free.