How to choose the right distributor for the number of circuits, flow rate, and heating power? A guide using KAN-therm distributors as an example.

Added: Monday, 10/6/2025


Distributors are connecting elements for individual circuits in heating and hot water installations, as well as underfloor heating. They are definitely a more reliable alternative to tee mechanisms. Thanks to the distributor, it is possible to efficiently and controllably distribute and distribute heat. Various types of distributors are available, designed for different installations, numbers of circuits, flows, and operating parameters. We advise how to make the right choice using the example of KAN-therm distributors. 

Complex heating installation with many steel pipes

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Types of distributors – which type to choose?

The modern hydraulic market offers various types of distributors. Their correct selection is crucial for the proper, efficient operation and comfortable use of the heating system. 

In domestic heating installations with radiators and in systems using underfloor heating, installation distributors are primarily used – due to, among other things, easy installation and the possibility of dividing the heating installation into about 10 circuits. On the other hand, special boiler distributors are used in boiler rooms and heat nodes. 

Moreover, depending on the type of installation, and thus its purpose, we can distinguish: 

  • distributors for heating installations with radiators;
  • distributors for heating installations with surface heating (floor, wall, ceiling);
  • mixed sets, when the heating installation is based on both radiators and surface heating.

A similar division is used by KAN-therm, offering modern, durable, and efficient InoxFlow distributors for all applications:

  • distributors for heating and hot water (R):
  1. distributors with internal threads 1/2'' - series RBB,
  2. distributors with nipples 3/4'' - series RNN,
  3. or distributors with nipples 3/4'' and shut-off valves - series RVV;
  • distributors for underfloor heating (U) with regulating valves or flow meters:
  1. distributors with regulating valves - series UVN,
  2. distributors with flow meters - series UFN,
  3. distributors with flow meters and valves for actuators - series UFS,
  4. distributors with regulating valves and valves for actuators - series UVS,
  5. distributors with regulating valves and valves for actuators and a venting section - series UVST,
  6. distributors with flow meters 2.5 l/min or 5 l/min (max) and valves for actuators and a venting section - series UFST and UFST max;
  • distributors for underfloor heating with a mixing system (P):
  1. distributors with regulating valves and valves for actuators and a mixing system with an electronic pump - series USVP;
  2. distributors with flow meters and valves for actuators and a mixing system with an electronic pump - series USFP.

To choose the right KAN-therm distributor, you need to look at the series designation. The combination of letters InoxFlow distributor with valves for actuators and flow meters (series UFST) - 12 circuits 1316157087 U|S|F|P indicates the purpose of a given model:

  • U (R or U) – Radiator refers to distributors for heating and hot water installations, while Underfloor heating refers to distributors for underfloor heating;
  • S F (B, N, S, V or F) – these letters indicate the equipment of the upper or lower beam, where Basic means no equipment, Nipples means nipples, Servomotor valves means valves for actuators, Valves means shut-off or regulating valves, and Flowmeters means flow meters;
  • P (T, A or P) - these letters indicate additional equipment, where Top means a vent on the top of the beam, Axis means a vent in the axis of the beam, and Pump means a pumping group.

Choosing a distributor for the number of circuits, flow, and operating parameters of the installation

When choosing a distributor, you should pay attention to 3 main aspects:

  • number of circuits – depending on individual needs, you need to choose a distributor that allows for the creation of a specific number of circuits, usually from 2 to 12;
  • presence of a flow meter – modern distributors are equipped with regulating valves or flow meters, which allow for controlling and adjusting the flow of water in individual heating loops within a specified range (the recommended water flow for underfloor loops up to 100 mb in length is on average 1.5-2l/min.);
  • operating parameters of the installation – each model of distributor is designed to operate under strictly defined conditions, i.e., temperatures and pressures, and these values must not be exceeded. 

We probably don't need to mention that the distributor should be made of high-quality, durable materials, such as stainless steel or brass. It is worth buying certified products from trusted brands. 

If you have any doubts, we encourage you to consult the choice of distributor with a seller, manufacturer, or heating installer. 

FAQ

1. What is the purpose of a distributor?

A distributor connects individual circuits in heating and hot water installations, as well as underfloor heating, allowing for effective and precise distribution and distribution of heat. 

2. How to choose the right distributor for a heating installation?

The distributor should be matched to the planned number of circuits (usually from 2 to 12) and to the operating parameters of the installation, especially temperatures and pressures. To easily select the right distributor from the KAN-therm brand, you should check the series designation. The combination of letters (U|S|F|P) indicates the purpose of a given model.

3. What role do flow meters play in KAN-therm distributors?

Flow meters allow for the control and regulation of water flow in individual heating loops, optimizing the operation of the installation and ensuring even distribution of heat.

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