Built in pressure relief valve. Please remember that with all instantaneous electric water heaters the incoming cold mains temperature and the flow rate directly affect the temperature of the water coming out.
If the water is too cold, decrease the flow at the taps. If it is too hot, increase the flow. The item "9Kw / 11Kw or 13.5Kw Multipoint LCD Electric Tankless Instant Hot Water Heater" is in sale since Sunday, May 31, 2020.
This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Heaters & Radiators\Water Heaters\Tankless Water Heaters". The seller is "man_led" and is located in Manchester, Lancashire. This item can be shipped to United Kingdom.