Which shunt should you choose?

The choice of shunt depends on the heat source, control requirements and the size of the system. The shunt has the task of ensuring the correct flow temperature to the underfloor heating system and is therefore a crucial component for both comfort and energy efficiency.

Roth offers both 2-way and 3-way shunts – with either thermostatic control or weather compensation.

2-way shunt – simple and effective regulation

A 2-way shunt is suitable for underfloor heating systems of up to 240 m², depending on the heat demand, floor construction, etc. In some systems, there will be no problem in covering 300 m or more. The shunt ensures stable and reliable temperature control, which can be carefully adapted to the individual system.

Typically used in conjunction with district heating or boiler systems
Adjusts the flow temperature by mixing hot flow water with cooled return water
Ideal for systems with uniform heat demand

Choose a 2-way shunt if the system has a pump pressure from, for example, a boiler, district heat exchanger or direct district heating.

3-way shunt – optimal comfort in larger systems

A 3-way shunt can do the same as a 2-way shunt, but can itself draw the water from, for example, a buffer tank. There must be no pump pressure against a 3-way shunt.

Typically used in systems with buffer tanks, for example where straw and pellet boilers send heat to a buffer tank.
Adjusts the flow temperature by mixing hot flow water with cooled return water
Ideal for systems with uniform heat demand

Choose a 3-way shunt when the shunt pump itself must draw the feed water from, for example, a buffer tank. Never use a 3-way shunt if there is pump pressure against the shunt.

Thermostatic regulation – when the need is constant

Shunts with thermostatic valve regulate the flow temperature based on a fixed set value.

Simple and reliable solution
Requires no electrical connection for the regulation
Suitable for homes with a steady heating demand all year round
If flow temperature control is required, the shunt must be combined with a Roth valve module.

Weather compensation – intelligent and energy-saving

Shunts with weather compensation automatically adjust the flow temperature to the outside temperature.

Provides optimal comfort in changing weather
Reduces energy consumption
Ideal for modern, energy-efficient buildings

Choose weather compensation if you want maximum comfort and optimal use of energy.

Roth shunt 3-way with thermostatic valve

Roth shunt 3-way with weather compensation

Roth shunt with weather compensation

Roth shunt with thermostatic valve