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The next scenario is when the hot water is not reaching the temperature set on the app (e.g. the app is trying to heat the hot water to 65°C but the hot water is plateauing at 55°C). This can be caused by one of two issues:

1. Is an insufficient schedule for your hot water. Sometimes for the Hot Water to get to the temperature you might need to extend the heating period.

So for example, if you are having the hot water on for 30 minutes try the extend the period for 60 minutes and see if the temperature is getting to the temperature you want. Especially if the hot water is being shared with radiators at the same time the hot water is being heated it might take longer for the hot water to get up to temperature.

2. The cylinder stat is reaching its limit temperature and turning the boiler off (e.g. the cylinder stat is only set to 55°C)

A cylinder stat is a hard-wired device attached to your hot water tank which stops the tank from getting too hot (and either scalding someone or damaging the plumbing), and normally can be set between 40 and 80°C. If the hot water is not getting as hot as you would like, you can try increasing the temperature of the cylinder stat by a couple degrees.

Caution: Hot water can be dangerous and lead to scalding and serious injury. Only adjust the cylinder thermostat if you know what you are doing. If you are unsure, consult a plumber or heating engineer.