Not for energy-conscious

Besides being in the inner part of the water regulator is made of plastic, there is a small part been canceled, the valve looks chic and is easy to operate. The broken part does not affect the operation so far.
BUT that one but here is particularly energy conscious deceiving. What is never mentioned is the following:
The valve requires a minimum pressure of the supply line and forth a minimum temperature for the hot water for a smooth operation. I was under the water pressure to 3.5 bar set standing in my family house, with running water that is then 3.0 bar. The temperature in the boiler was 47 ° C. Unfortunately, the thermostat does not work in these situations. In the beginning the water is indeed at the desired temperature, but after a few minutes it is getting colder so you have to hurry. Grohe have to their credit, after complaining soon two plumbers came and attention made that the valve a minimum temperature of 50 ° -55 ° C, and a fresh water duck of 4.5 bar is required to function properly. Now I have made these settings in the house and it works. Unfortunately, the water temperature will be kept permanently on the higher value which of course leads to higher gas costs. The increased water pressure flows naturally despite various savings intentions more water, thereby increasing the water consumption. In an apartment all will not play such a big role. But if you can consciously influence energy consumption, this is not an optimal solution. For homeowners therefore not advise. Is a pity that part of Grohe nowhere in the product description noted.