Boiler - a definition from Wikipedia
A boiler is a closed vessel in which water or other fluid is heated. The fluid does not necessarily boil. (In North America the term "furnace" is normally used if the purpose is not actually to boil the fluid.) The heated or vaporized fluid exits the boiler for use in various processes or heating applications,12 including water heating, central heating, boiler-based power generation, cooking, and sanitation.
main water valve
When we find that in the house there is a water leak, the cause of which we can not define ourselves, we should immediately call a plumber. It is also important that we immediately shut the main water valve that shut off the water supply to taps and various water bodies existing in the home, and thus we prevent its further flooding. In new homes closing the main valve is not a problem, but in the case of older homes may be harder for us to determine which of the existing valves is the main water valve and an additional difficulty may be the same turn. In such a situation called our plumber will also replace the old water valve installed in our house.
Water valve on the washing machine
Connecting the machine is connected with the provision of its good water drainage. As a result, our clothes are cleaned properly and we will not have to contend with the problem of leakage of water from the washing machine. One of the causes of such leakage is, in fact, not connected to the drain hose of the washing machine water from it. So it is good that we are not trying to connect the machine alone, but ordered professional to best plumber who turns on the occasion of our washing machine for the first time and check if it was really well connected. It is also important that the water valve mounted on the washing machine was not sure and did not allow for the fact that the water starts to pour into the machine, although it was not by us on.