Increasingly often in our country, a solution is used that combines the advantages of underfloor and radiator heating . Thanks to this, users gain high thermal comfort, even when the outside temperatures are exceptionally low. At the same time, it is a very convenient system to use. If you perform such installations for your clients, read our guide on pump groups!
In this article you will learn:
- how the pump-mixing group works,
- what elements does the pump-mixing group consist of,
- how to select a pump-mixing group for underfloor heating.
What are pump groups?
A pump group is a device that combines the functions of a pump and a valve. It is the most popular and effective way to distribute temperatures between underfloor heating and radiator heating . In order for such a system to operate with maximum efficiency, a lower temperature must be provided for the first and a higher temperature for the second. The device mixes factors from both circuits for the needs of the surface installation.
It is worth considering the installation of a pump-mixing group at the design stage of the building. Its inclusion allows, for example, the adaptation of the electrical installation to the pump power supply. This also avoids the problem of mismatching the size of cabinets to distributors.
The pump group is a guarantee of obtaining the desired temperature of the heating medium and maintaining it at a constant level. It is used where it is necessary to provide a medium with the appropriate pressure and a temperature reduced in relation to the temperature of the medium leaving the heat source.
Check out Valvex pump-mixing groups
Advantages of using pump groups
The benefits of using pump-mixing groups can be multiplied. Among the most important advantages, it is certainly worth mentioning:
- saving time,
- saving space,
- better access to installation elements in the boiler room,
- more attractive visual effect,
- increased installation reliability (reduced number of connections between components).
Types of pump-mixing groups
Pump-mixing groups are divided primarily into models designed for central installation in the boiler room and models for installation at manifolds. Pump groups designed for central installation are usually equipped with manual mixing valves for automation, which require actuators and appropriate control devices. In the case of groups mounted at manifolds, thermostatic mixing valves are usually used.
Construction of pump groups
Pump groups with a mixing valve consist of several elements that perform similar functions. These are the parts such as:
- three-way or four-way valve allowing to regulate the temperature of the heating medium. Depending on the type of pump group, these may be mixing valves equipped with an actuator or thermostatic valves.
- thermometer indicating the temperature of the supply and return water
- a circulation pump responsible for mixing hot water with cooled water and ensuring proper circulation of the medium in the heating loops.
In sets with a mixing valve, the heating medium coming from the heat source is mixed with the cooled medium returning from the surface heating system. In this way, a medium with a reduced temperature is supplied to the system.
Which solution to choose?
When choosing a pump group, special attention should be paid to the issue of installation. As mentioned above, it is worth considering whether it is better to install the device locally or centrally. The first option will work well in a situation where the underfloor heating is supplied from a single distributor. By installing the group right next to it, you will avoid an additional riser in the installation, making the whole process easier and cheaper for your customer. The second solution is intended for buildings in which surface heating occurs on more than one level and is supplied by, for example, two distributors. In such a case, the pump group should be located in the boiler room, on a separate riser.
Pumping and mixing groups from Valvex
You will select a centrally mounted group when:
- you are installing in a new building,
- a sufficiently large boiler room is available,
- it is possible to install a device to control the operation of the valve or the heat source is equipped with such an element.
The group mounted at the distributor will work better when:
- you are modernizing the installation in an old building,
- there is not enough space in the boiler room for additional equipment,
- no provision is made for the installation of a device to control the operation of the mixing valve.
Exchange benefits on the new OnnTop loyalty platform!
If you intend to install a mixing valve and pump in the boiler room, try to select the group taking into account the possibility of installing the device in this room. For example, choose PROFFmix from Valvex. Thanks to this solution, the elements of the set will not generate noise in the mounting cabinets, which would have to be located in the living rooms. In addition, in such a situation, it is easier to lead electrical cables responsible for the integration of the control of mixing systems and circulation pumps to the device. This is also an aesthetic solution, because large mounting cabinets would negatively affect the appearance of the interior. Your customers will certainly appreciate such conveniences.
Pump groups mounted directly at the distributors are equipped with thermostatic mixing valves. In this case, no valve control device is required and the thermostatic valve insert is responsible for the proper operation of the valve. The required temperature of the medium is set on the mixing valve knob. The valve operation independent of external control allows the distributor to be placed away from the boiler room, providing only the power supply necessary for the pump operation. Valex recommends choosing a group from the PROFFPLUS series.
Selection of the pump group
When selecting pump groups for a heating system, the total length of the underfloor heating loop and the design of the flows in the individual loops should be taken into account. These parameters must be compared with the capabilities of the pump and the mixing group valve. These elements must be able to balance the pressure losses in the system.
Therefore, choose the pump group based on the required pump and mixing valve parameters. You will be helped to determine:
- required pump lifting height,
- required KVS coefficient of the mixing valve.
This way you will avoid installing a valve that is too small or oversized.
The issue of selecting a pump group for an underfloor heating system may seem a bit complicated. Fortunately, manufacturers of these devices use a system that makes this task much easier. They design sets for specific heating surfaces. They are determined by assuming average standard parameters for underfloor heating. In the case of simple installations, you can therefore use the manufacturers' recommendations. However, if you are dealing with non-standard systems, calculate the required parameters yourself.
Check out Valvex pump-mixing groups
PROFF PLUS pump-mixing group from Valvex
If you are looking for energy-saving solutions for your customers, you need to get to know the Valvex brand range. It is one of the leading manufacturers of bathroom and kitchen faucets, as well as fittings for water, gas and central heating installations. This Polish company is well-known to contractors and users all over the world - from the European Union, through the Middle East, to North and South America. It is synonymous with high quality, reliability and attractive design.
Among the numerous Valvex brand products, we recommend the PROFF PLUS pump-mixing groups to your attention . This system solution guarantees obtaining the optimal temperature of the heating medium in the underfloor heating installation. Its mixing system is based on the innovative TERMOCONTROL 4-way valve. The pump used here is characterized by smooth regulation of the rotational speed, and the innovative connection system definitely facilitates the installation of the device. Thanks to the nuts, you can easily correct the thermometer settings and tighten the set to the manifold. The PROFF PLUS pump group is a guarantee of tightness and reliability!
Check out the Valvex brand range available from Onninen and get pump-mixing groups that will help you provide your customers with efficient and energy-saving underfloor heating!
Have questions about the industry? Join the Świat Instalacji group!