The hot water pressure is stable, and hot and cold temperatures are caused by the increase and decrease of cold water pressure.
Methods: 1. Ask Huangming Company to replace mixing valve with fine adjustment for free. Their company has one
2. Just add a thermostatic valve. The market price is around 200 yuan. Easy to use, hard to replace. But it breaks easily, so choose good quality. Huang Ming didn't.
It's really hard to say because we don't know the initial water temperature, heating power and water storage capacity. I can give you a formula:
Heating time (seconds) = (reached water temperature ℃ - initial water temperature ℃) × water storage capacity L × 4.8 /heating power (kW)/efficiency
For example: The initial temperature of the water is 10°C, the capacity ofwater storage is 100 L, the heating power is 1.5 kW, and the efficiency is 80% (the efficiency of electric supplementary heating of solar water heaters is generally low). The time to heat to 55°C is:
(55-10)×100×4.8/1.5/0.8=18,000 seconds or 5 hours.