High efficiency appliances that consume less water were used: The average flow rate of all lavatory and shower faucets is ≤ 2.0 GPM and the average flow rate of all toilets (dual flush) is ≤ 4.9 LPC (1.3 GPC). Toilets are certified Watersense. Hybrid water heater Voltex, electric heat pump, HPTU-80 is installed: a heat exchanger absorbs the heat from the ambient air and transfers it to the water using heat pump with responsible refrigerant R134a harmless for the environment. Bathroom fans are brand Ortech 110 CFM and 0.9 sones with timer and in garage, a fan was installed to remove carbon monoxide. It is activated by motion detector. Note that master bedroom bathroom floors are electrically heated.