The Importance of Installing Underfloor Heating Mixing Valves

Do you know what is a mixing valve in the underfloor heating system? Lets learn the function first. Basically, underfloor heating mixing valves work by mixing hot water with cold water to regulate the temperature of the water flowing through the underfloor pipes. This crucial component in a hydraulic underfloor heating system draws hot water from the boiler and cold water from the return loop. When these mixing valves function properly, the system will provide stable heat.

Stable heat, maintained at the ideal temperature you set in advance, ensures comfort. The room will not become too hot, and the underfloor heating mixing valves will also prevent damage to floors and other materials.

Main Function of Underfloor Heating Mixing Valves

The main function of underfloor heating mixing valves is to act as a temperature controller. All water entering the underfloor heating system must be at the ideal temperature. Temperatures ranging from 35°C to 45°C are safe and help prevent damage to floor materials while ensuring efficient heating.

Efficiency in the system means that mixing valves effectively maintain a consistent flow temperature by mixing hot water with cooler return water. As the overall efficiency of the heating system increases, energy consumption gradually decreases.

Mixing valves also prevent the pipes from overheating. When the temperature in the pipes rises too high, the risk of damage increases. This can lead to severe leaks or even total system failure.

Types of Underfloor Heating Mixing Valves

Many modern underfloor heating mixing valves allow for manual or automatic temperature adjustment. Some feature thermostatic control, while others can be set to a specific temperature based on the system design.

It’s important to be observant and well-informed when choosing the right type of underfloor heating mixing valve for your home system. Below are three common types of mixing valves available on the market:

TMV (Thermostatic Mixing Valve)

The thermostatic mixing valve (TMV) automatically adjusts the mixture of hot and cold water. This is essential for maintaining the temperature you have previously set within the system.

Manual Mixing Valve

As the name suggests, this valve requires the user to adjust it manually. You can turn the knob or press a button to control the mixture of hot and cold water.

Motorized Valve

The motorized or electronic valve operates through a programming process. As a user, you can control it remotely, adjusting the mixing based on your heating needs.

Installing Underfloor Heating Mixing Valves

Installing underfloor heating mixing valves requires precision and attention to detail to ensure proper operation, which in turn increases system efficiency.

You can install underfloor heating mixing valves yourself if you are familiar with the general steps outlined in the guide and have the necessary plumbing expertise. However, if you’re unsure, especially when dealing with more complex or extensive installations, it’s best to call a professional plumber.

Tools and Materials You’ll Need

Start by preparing the main tool: the underfloor heating mixing valve. You can choose from manual, motorized, or TMV (thermostatic) series. Be sure to source the valve from a reputable manufacturer known for producing innovative products that will enhance your system’s energy efficiency.

Additionally, you’ll need the following tools and materials:

• Pipe cutter.
• Plumber’s tape (PTFE).
• Flow and return pipe connectors.
• Screwdriver (for tightening the valve in place).
• Pipe insulation.
• Thermometer (to check the water temperature).

Installation Steps

Always begin by turning off the heating and water supply systems before installing underfloor heating mixing valves. Then, drain the system to prevent any spills. Follow these steps to ensure proper installation:

Valve Placement Planning

Determine the location for the mixing valve. The placement is usually between the heat source (such as a boiler or heat pump) and the supply manifold of the underfloor heating system.

Install the mixing valve on the flow pipe to regulate the water temperature before it enters the underfloor system. Ensure the valve is easily accessible for future adjustments and maintenance.

Pipe Cutting

Install the mixing valve where the hot supply, cold return, and mixed flow lines meet. Use a pipe cutter to ensure clean, symmetrical cuts. Neat pipe cuts will help ensure proper sealing when adding connectors.

Valve Installation

Install the mixing valve at the point where the hot water supply, cooler return water, and mixed flow lines meet. This is typically between the heat source (e.g., boiler or heat pump) and the manifold. Use the appropriate connectors, which may include compression fittings, press fittings, or soldering, depending on your system. Make sure to use PTFE tape on the connector threads to create a watertight seal. Some valves may already have compression fittings installed, while others will require you to add them.

Installing a Temperature Sensor

Some mixing valves require a temperature sensor to monitor the incoming water temperature. If so, install the sensor in the recommended location, often on the return pipe, as advised by the manufacturer.

Connecting the Return Line

Connect the return pipe from the underfloor heating system to the return port of the mixing valve. This ensures that the return water mixes with the hotter water from the boiler before being delivered to the underfloor system.

Set the Temperature

For thermostatic mixing valves, set the temperature control to the desired level. Ideally, the temperature should be in the range of 35-45°C for underfloor heating systems. For manual valves, adjust the valve until the ideal temperature is reached. Use an internal thermometer to monitor this.

Check for Leaks

Once the mixing valve is good in installation, slowly turn on the water supply and check for leaks around the connections. Tighten any loose connections if necessary.

It is important to address leaks before operating the system. Once you’re confident that there are no leaks, reconnect the system and turn it on.

Final Monitoring

Monitor the valve’s operation to ensure it is working correctly. After the system reaches the correct temperature, you should begin to feel warmth coming from the floor.

Conclusion

With the right mixing valve and a careful installation, your underfloor heating system can run more smoothly, safely, and efficiently. It’s a small part that makes a big difference, we help you to keep your floors warm and your energy bills in check. Consult with us!