Depending on the purpose of flow EVN, you will need different amounts of hot water. For example, the washbasin requires about 1,8-2 l / min, for the soul – about 4 l / min, combined models, from 4 l / min. In line with this, must be chosen, and the power unit. Based on years of experience, manufacturers recommend the following capacities:
* For the washstand: 3-6 kW;
* For the soul: from 7 kW;
* Combined: 8 kW.
Help the gas tankless water heater is better to work!
It is clear that for normal speakers, it is necessary to provide the necessary pressure, not only in gas, but also in the water supply network. What to do if this pressure is too low. In this case, can help a special pump to increase pressure. In particular, such a device produces one of the leading manufacturers of pumping equipment – Danish company Grundfos. The model of the pump to increase pressure, called UPA. It is very compact and is lightweight (2.5 kg), which allows it to mount directly on the pipeline.
The design of this taco pump (taco 007) is quite simple and, hence, reliable. It consists of a body in which the rotor with the impeller mounted on it. Grundfos UPA refers to the type of pumps, which are called pumps with wet rotor. Lubrication of the pump is pumping water. Also, the water acts as a cooling. It is clear that this should be provided with a continuous circulation of water through the pump casing. As the dignity of pumps with wet rotor, it is worth noting the absence in their designs moving seals between the rotating shaft of the electric motor and a fixed body. In addition, the use of wet rotor provides a near silent pump. Due to this, Grundfos UPA does not disturb your comfort, it can be installed anywhere in your house or apartment. If we talk about installing the pump, it is important to observe the mandatory requirement – its shaft must always be in a horizontal position.
Do not think that if the pump is very small dimensions, it has, and small features. On the contrary, the pump Grundfos UPA-120 has a flow of 3 m cube. / H and pressure up to 12 m.
A few words about the management of the pump. Grundfos UPA switch equipped with three provisions:
* Manual mode. In this mode, you can turn on and off the pump when you need it;
* Automatic mode, in which the pump automatically switches on and off, with built-in sensors, ie, when you open or close the valve;
* Pump is turned off.
It should be borne in mind that each pump must be protected from running dry. Dry progress occurs in situations where the pump is running, but water in it at this point does not exist. The result can be damage to the bearings. Grundfos UPA pumps are protected from running dry, which is provided by a built-in sensors.