Problem
Lukewarm or quickly depleted hot water is inconvenient, but the cause is often simple: too low a setpoint, an undersized tank, or a thermostatic mixing valve setting.
1. Tank target temperature on the control panel. 2. Thermostatic mixing valve setting, which limits tap water temperature. 3. Tank volume relative to household size. 4. Hot water cycle timing, if it coincides with peak demand.
If the setpoint is fine but the tank doesn't reach it within several hours, the problem could be the heat exchanger, circulation, or the unit's priority setting. In that case we recommend having it inspected.
The right temperature depends on the cylinder, pipework and manufacturer requirements. A lower setting saves energy but needs suitable Legionella protection — there is no single universal number.
Only slightly more standby loss. Frequent reheating of a small tank can end up more costly overall.
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