- ✔ We switch off the boiler switch and switch on the drinking water pump
- ✔ All taps are opened (hot water side)
- ✔ As soon as all the water is out, the drinking water pump is switched off again
- ✔ The water tank is drained (the boiler is not forgotten)
- ✔ All drinking water hoses are disconnected from the boiler and drinking water pump
- ✔ We blow the whole system through with a compressor so that all the water is completely out