Given the supreme energy efficiency, cost savings, and internal comfort given effect by underfloor heating solutions, buyers stand to gain more than what they pay for.

There is a number of reasons why the pressure in a vessel or system can exceed a predetermined limit. API Standard 521/ISO 23251 Sect. 4 provides a detailed guideline about causes of overpressure. The most common are:

In addition to this, they’re also known to be very easy to run and maintain. With their automatic heating control or through a smart thermostat, ensuring that radiant heating systems meet every need is no hassle. Further, very little maintenance is required throughout the lifespan of the system.

There are two main types of pressure relief valves / safety valves: Spring-loaded pressure relief valves and pilot-operated pressure relief valves. Also relevant are so-called change-over valves, which ensure continuous system availability (not included in the illustration).

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In this regard, radiant heating is certainly a hot topic in the industry. While we’ve provided a succinct overview of this subject in previous blogs, this week, we focus on the pros and cons of radiant floor heating.

Safety valves

Each of the above listed events may occur individually and separately from the other. They may also take place simultaneously. Each cause of overpressure also will create a different mass or volume flow to be discharged, e.g. small mass flow for thermal expansion and large mass flow in case of a chemical reaction. It is the user’s responsibility to determine a worst case scenario for the sizing and selection of a suitable pressure relief device.

Traditional heating devices such as radiators, on the other hand, need to be heated to a high temperature in order to provide the same level of comfort. This figure is as high 65℃-67℃ compared to the 29℃ or less required for underfloor heating systems.

Infinitely popular underfloor systems are noteworthy due to one key feature - radiant floor heating. Here, with the use of a room’s surfaces, objects, and occupants themselves, heat is transmitted to specific objects and not the air itself. This is not just an efficient and effective way of transmitting heat but also maintaining a healthy living environment for those inside.

Water-based systems take a little longer, although this isn’t usually a problem given that installation takes place during construction or renovation efforts.

Pressure valve

For the sizing of pressure relief valves LESER has developed its own free software VALVESTAR®. You can access the tool via the following link.

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In the context of pressure relief devices, a fundamental distinction can be made between reclosing and non-reclosing devices. Pressure relief valves are part of the reclosing devices and are differentiated on the basis of their loading principle or controllability.

The primary purpose of a pressure relief valve is to protect life, property and the environment. Pressure relief valves are designed to open and release excess pressure from vessels or equipment and then close again.

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In order to ensure the greatest possible plant safety, the analysis of the conditions and requirements of an application and the corresponding dimensioning of a pressure relief valve is crucial. Determining the necessary dimensions and flow cross-section of a pressure relief valve is referred to as "sizing the pressure relief valve". Numerous parameters are taken into account in this calculation.

Depending on the thermal conductivity of the flooring chosen, the efficiency of these systems can be increased, saving property owners significant electricity costs.

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For the installation process, a self-levelling compound needs to be applied on top of electrical underfloor heating systems, which needs to dry completely before a floor covering is put in place. While this usually just takes a day or two, it can cause short-term inconveniences.

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One of the biggest pulls towards these kinds of systems is that they can heat up spaces effectively, whilst remaining highly energy-efficient. Here, both types of systems, electric and water-based, can provide properties with luxurious and comfortable warmth.

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Given that these systems are located out of sight, a wide variety of flooring options and other aspects of interior design can be accommodated with ease. Thus, unlike radiators and other bulky heating devices, there are no unsightly objects in the visible space, rendering properties not just warm and comfortable but also extremely easy on the eyes.

While radiant heating systems can prove to be expensive at the start, its pros far outweigh the cost and minor inconveniences that come with it.

Despite the fact that these systems tend to pay back cost over time owing to high energy efficiency, they can still prove to be somewhat expensive at the outset.

In addition, a distinction can be made based on the function of the valves. Here, a distinction is made between relief valves (full lift), normal safety valves and proportional safety relief valves.

The following symbols are related with the main types of pressure relief valves:                      Spring-loaded Pressure Relief Valves and Pilot-operated Pressure Relief Valves

The primary purpose of a pressure relief valve is the protection of life, property and environment. A pressure relief valve is designed to open and relieve excess pressure from vessels or equipment and to reclose and prevent the further release of fluid after normal conditions have been restored.

The function of pressure relief valves differs depending on the main type or loading principle of the valve. The main types of pressure relief valves are spring-loaded, weight-loaded and controlled pressure relief valves.

Underfloor heating is notoriously easy to install, even if it’s a part of a renovation process. Given how versatile these systems are, they make a great addition in a range of properties, even old buildings.

The main types of pressure relief valves are identified by symbols. Therefore, there is not only one, but several pressure relief valve and safety valve symbols. They are often shown on pressure relief valves or their packaging. In addition, they are used in technical drawings and schematics as well as system sketches - for example, in the description of DIN standards.

Here, the cost is usually estimated per square foot and will depend on the type of system chosen for the property. Apart from installation, acquiring the services of other professionals including electricians and plumbers is also necessary. Time and cost for each service, in turn, will depend on a number of factors.

Hydronic underfloor heating systems are generally more expensive, often costing 2-3 times more than electrical variants.

Further, radiator and other similar devices heat the air closest to them, creating cold spots in the room. They also tend to make the internal environment stuffy, forcing occupants to open windows for some fresh air. This releases the heat outside, wasting the energy used to power up the radiator.

The function und design of pressure relief valves differs depending on the main type or loading principle. Use the following icons to navigate to the respective main type page. There you will find the corresponding LESER pressure relief valves as well as further information, for example on the function and design of the main types.

In these areas, radiant floor heating proves to be an exceptional choice, providing warmth from the floor up. This prevents cold spots from occurring and maintains a pleasant and comfortable internal environment.

Another factor that makes underfloor heating such a lucrative option is that it allows property owners to design and decorate spaces with complete freedom.