The circulating pump for domestic hot water acts as one of the important components of the system. Without this equipment, it will not be possible to achieve pressure, as well as the circulation of water in the wiring. Therefore, before purchasing this unit, it is necessary to take into account the nuances that affect work efficiency and purpose.
Description in terms of design features
Comparing several models of circulation pumps, you can understand that, first of all, they differ from each other by the type of rotor. According to this feature, the described equipment can be classified into devices with:
In the first embodiment, the supporting part, which assumes the presence of the impeller, is placed in the pumped medium. In this case, the hot fluid acts as a lubricant and cooler. Pumps with a wet rotor produce almost no noise during operation and are characterized by a long service life. They are cheap and do not require maintenance. This indicates that such a circulation pump for domestic hot water can be put on and forget about it.
However, such aggregates also have disadvantages, one of which is expressed in a low efficiency, it ranges from 40 to 45%. Among other things, the positioning of the pump is limited, because it can only be installed horizontally. Therefore, this equipment is purchased by those people who want to equip a heating and water supply system in a small house. Indeed, this unit is not capable of great achievements.
Description of the dry rotor pump
The circulation pump for hot water supply can also have a dry rotor, in which the power plant is separated from the pumped medium. The rotor remains dry during operation, which causes problems with cooling and lubrication. The problem is solved by periodic inspection, as well as with the help of a fan.
Dry pumps are more expensive in the long run, both at the acquisition stage and at the maintenance stage. But these chores will be rewarded with more impressive performance, which reaches 70%. Therefore, such a circulation pump for domestic hot water can be purchased for installation in utility and industrial systems.
Key Performance
The main task of the described equipment is to maintain the flow rate of the water through the wiring. Therefore, the main criteria that affect the choice of the pump are:
- pressure value;
- consumption;
- heat transfer.
The pressure parameters are determined by the height of the water column, the pressure and temperature at the return will depend on this. As for the flow rate, it is determined by the formula as the quotient of the power and the temperature difference in the processing and pressure pipe. Heat transfer is determined by the area of the heated room and heat loss.
Wilo-Star-Z Pump Description
Choosing a circulation pump for domestic hot water, you can pay attention to the model mentioned above. It is a unit with a wet rotor, which can be used to maintain pressure in water and heating networks. This model has mechanical shut-off valves and electronic filling.
As for the first component, it involves the presence of a ball valve at the outlet and a check valve. The electronic component is:
- display;
- thermostat;
- timer.
This pump option can be used in conventional systems and high-tech networks that are built into the smart home system. Wilo circulation pump for domestic hot water has a thermal disinfection recognition system, which is used when working with drinking water.
Features of the VortexBW 152
This equipment is manufactured in Germany, which means it is of high quality. The model is characterized by high performance and maintainability. Disassembling the device can be quite simple, but the unit itself is not necessary to be dismantled. Without removing the pipe, the pump can be descaled. It works completely silently and differs from its analogues in modest dimensions, therefore it is often used in everyday life.
Description of the ESPA RA1-S pump
This circulation pump for domestic hot water systems is another representative of equipment with a wet rotor. It can be used for air conditioning and ventilation. The main difference from analogues is the possibility of vertical installation. You can use the equipment in cold water supply and hot water supply systems. The device is capable of pumping a heated, flammable liquid, the temperature of which reaches 120 ° C. In everyday life, the device has proven itself positively; it is productive and economical.
Specifications Grundfos UP
DHW circulation pump UP is equipment with a heat-insulating casing, the flow part of which is insulated from the stator by a sheath. The engine has a wet rotor, which provides almost silent operation. If necessary, the equipment can be disassembled without removing the case from the pipeline. The unit does not require maintenance.
This Grundfos DHW circulation pump can operate at one of three speeds, its electric power is 25 watts and its operating pressure is 10 bar. The temperature of the pumped medium can vary from 2 to 95 ° C. The recommended set is 0.93 m, while the connection is made with the following parameters Rp 1/2. The recommended flow rate is equivalent to 0.38 m 3 / h. The installation length is 80 m, the maximum head is 1.4 bar. The device weighs 2.6 kg, and the class of protection against water corresponds to the designation IP42.
Key features and benefits of Grundfos UP pumps
Before you purchase pumps Grundfos UP, you should consider their distinguishing features from analogues, they are:
- spherical rotor;
- low noise;
- protection against calcareous deposits;
- long service life.
Consumers choose these devices also for the reason that their operation is accompanied by insignificant electricity consumption. In the manufacturing process, high-quality materials are used, and any home master can install the device.
After installing such a pump, you can get hot water as soon as you open the tap. The presence of a spherical rotor almost eliminates the blocking of the impeller by lime deposits and impurities. The plug-in connector is reliable and simple, thanks to this the connection to the power supply is greatly simplified, as well as the operation.
Fluids and operating limits for Grundfos circulation pumps
Before purchasing a circulation pump, it is important to consider the pumped media. When it comes to Grundfos UP models, they are able to work with aggressive, inviscid, clean fluids that do not have particulate matter and fibers. Such equipment is capable of working with water that has previously been softened. There are certain operational limitations, which are expressed in the maximum possible kinematic viscosity of water, it is 1 mm 2 / s, which is true for a temperature of 20 ° C.
Conclusion
Before choosing a circulation pump, the estimated pressure of the water flowing from the tap must be taken into account. The maximum permissible value of this parameter is 4.5 bar, while the minimum is not regulated.
It is also necessary to take into account the number of water taps that can be opened at the same time. If you create a pressure of 5 bar in the pipeline, then when you open one tap, the pressure will be higher than the permissible value, and the jet will damage the sanitary equipment.