There are devices that play an extremely important role and provide functionality and comfort. The circulation pump is undoubtedly one of them. It is worth learning more about it, its structure and power consumption, in order to choose the best model.
How does a circulation pump work?
The circulation pump is located in the water installation that prepares hot water. Its task is to deliver water from the heater to a point located, e.g. in the bathroom or kitchen. Thanks to this, you can have access to hot water at a constant temperature at every draw-off point. It is also important to remember that the temperature of the medium must be between 2 and 65 degrees Celsius. If the temperature is higher, scale may be released, which may damage the pump and impair its operation. It is also worth knowing that if the medium temperature is correct, the pump should operate without failure for years, as it is not a device prone to failure. The circulation pump has a low lifting height, but there is a high operating pressure, most often 10 bar. Thanks to this, installation resistances are overcome. DHW circulation works very simply. The hot water supply pipe is arranged in such a way that it circulates around the draw-off points. From the last point there is an additional pipe, which returns hot water to the tank or heater.
Check out the DHW circulation pumps at the wholesaler in Onninen
Circulation pumps above at the Onninen wholesaler
If you are looking for a good quality pump, the Onnline Pro electronic circulation pump with threaded connection will be a good choice. It is extremely efficient and has a non-return valve included. There are pumps with a wet rotor to choose from. They do not have a gland, i.e. a seal for the motor shaft. You can choose single-speed or multi-speed pumps, as well as models with smooth speed control that have an integrated frequency converter. 
It may be a good choice, for example Ferro two-speed pump . If the hot water installation is small, it is best to choose a pump with a ball impeller of simple construction. They are equipped with traditional asynchronous motors. Remember that water circulation causes energy loss, which in turn translates into higher costs. However, thanks to the use of an effective circulation pump, these costs are not so high. If you want to enjoy hot water immediately after turning on the tap, even if the draw-off point is far from the tank, then you should choose a device such as a circulation pump. To further reduce costs, you can turn off the pump, e.g. in the evening.
Construction of a circulation pump
The circulation pump should run quietly. It should also be resistant to dry running (read the article on how to protect the pump against dry running ). At the same time, good pumps do not block small impurities in the installation. An example pump consists of the following elements:
- seal, also known as O-ring
- ball rotor with a built-in permanent magnet
- pump body, which must be resistant to corrosion
- fixed spindle with ceramic ball bearing
- socket nut
- stepless speed knob
- commutated motor
The electronically commutated motor is equipped with a permanent magnet motor rotor. Thanks to this, there is no need to supply energy to magnetize the rotor. It is permanently magnetized, which helps reduce costs.
How much electricity does the circulation pump consume?
A good circulation pump does not consume much electricity, so you do not have to worry about costs. You can easily find a device that consumes from 2 to 4.5 W. If you are looking for such a pump, the Wilo Star Z NOVA circulation pump may be a good choice. We are talking here about pumps that have a synchronous motor. If you also turn off the pump at night, the costs will be even lower. So remember that the circulation of hot water not only makes life easier and more comfortable, but also prevents waste, i.e. draining cold water until it is heated. This solution allows you to reduce both water and sewage bills. If the insulation of the pipes in the circulation system is good, the circulation costs will also be low. Circulation works best in homes where people lead a regular lifestyle, so it is known that, for example, no one will want to take a shower late at night. In theory, it seems that you can choose a water heater, but you should be aware that in this case the costs will be much higher.
If you want to enjoy hot water immediately after turning on the tap, a circulation pump is indeed a good choice for you. You should choose high-quality devices that are durable, reliable and work efficiently. You will find these in the offer of the Onninen hydraulic and electrical wholesaler .
Check out the DHW circulation pumps at the wholesaler in Onninen