There are devices that play an extremely important role and provide functionality and comfort. Undoubtedly, the circulation pump is one of them. It is worth learning more about it, getting to know its structure, power consumption, in order to choose the best model.
How does a circulation pump work?
A circulation pump is present in the water system that prepares hot water. Its task is to deliver water from the heater to a point located, for example, in the bathroom or kitchen. Thanks to this, you can have access to hot water at a constant temperature at each draw-off point. It should also be remembered that the temperature of the medium must be between 2 and 65 degrees Celsius. If the temperature is higher, scale may be released, which can damage the pump and disrupt its operation. It is also worth knowing that if the temperature of the medium is correct, the pump should work without failure for years, because it is not a device prone to failures. The circulation pump has a small lifting height, but there is a high working pressure, most often 10 bar. Thanks to this, the resistance of the installation is overcome. DHW circulation works very simply. The pipe supplying hot water is arranged in such a way that it circulates the draw-off points. An additional pipe runs from the last point, through which hot water returns to the tank or heater.
Check out the DHW circulation pumps at the wholesaler in Onninen
Circulation pumps in the Onninen wholesaler
If you are looking for a good quality pump, then a good choice will be the Onnline Pro electronic circulation pump with a threaded connection . It is extremely efficient and has a non-return valve included. You can choose from pumps with a wet rotor motor. They do not have a choke, i.e. a seal for the motor shaft. You can choose single-speed pumps, multi-speed pumps, as well as models with smooth speed control, which have an integrated frequency converter. 
A good choice could be, for example: Ferro two-speed pump . If the DHW installation is small, then it is best to choose a pump with a ball rotor of a simple design. They are equipped with traditional asynchronous motors. Remember that water circulation causes energy losses, 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, and even in a situation where the draw-off point is a large distance from the tank, then this is when you should decide on a device such as a circulation pump. To reduce costs even more, you can turn the pump off, e.g. in the evening.
Construction of a circulation pump
The circulation pump should operate quietly. It should also be resistant to dry running (read the article on how to protect the pump from dry running ). At the same time, good pumps do not block small impurities in the installation. An example pump consists of the following elements:
- gasket also known as O-ring
- a ball rotor with a built-in permanent magnet
- pump housing, which must be corrosion resistant
- fixed shaft with ceramic ball bearing
- cap nut
- stepless speed knob
- Commutated engine
The electronically commutated motor is equipped with a permanent magnet motor rotor. This means that there is no need to supply energy to magnetize the rotor. It is permanently magnetized, which allows for cost reduction.
How much electricity does a circulation pump use?
A good circulation pump does not consume a lot of electricity, so you do not have to worry about the 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 about pumps that have a synchronous motor. If you also turn the pump off at night, the costs will be even lower. So remember that the circulation of domestic hot water not only makes life easier and provides comfort, but also prevents waste, i.e. draining cold water until it heats up. This solution allows you to reduce both water and sewage bills. If the insulation of the pipes in the circulation circuit 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 decide on a water heater, but you should be aware that in this case the costs will be much higher.
If you want to enjoy warm water right after turning on the tap, then 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 such in the offer of the plumbing and electrical wholesaler Onninen .
Check out the DHW circulation pumps at the wholesaler in Onninen