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How To Find The Right Cable Size Needed For Underfloor Heating

How To Find The Right Cable Size Needed For Underfloor Heating

You can be a homeowner who is unsure of the size of cable required for underfloor heating. Fortunately, we have this post to help you.

The size of the cable utilized for your underfloor heating system will depend on the type of thermostat you have and the area you’ll be heating in square feet. Choose a cable that is appropriate for your network area.

For underfloor heating, picking the appropriate cable size is not as challenging as it would seem. Learn more about cable sizes and underfloor heating systems by continuing to read.

For Underfloor Heating, What Cable Size Do I Need?

How To Find The Right Cable Size Needed For Underfloor Heating

It is essential to buy the right cable size for the job when repairing an underfloor heating system. You can save time and money during the installation by doing this.

Underfloor heating uses a variety of cable kinds, each with a range of sizes. Most of the time, the type of cable you should choose depends on the size of the room and the thermostat you have.

Prior to installing the underfloor heating system, you could try drawing the gross area’s proportions. Choose a heating mat or cable that is appropriate for the net area. Take measurements of your net area to accomplish this.

You must choose a heating cable that is adequate for an area of 32 square feet for a net area of 36 1/2 square feet. Different-sized cables might not fit.

The fact that you won’t need to heat the floor directly beneath anything that is built and takes up floor space, such as toilets and bathtubs, should also be noted.

Each of these fixtures, along with their sizes, should be precisely noted on your sketch. In essence, the space that is left is the net space that can be heated by underfloor heating.

By taking the gross area and deducting the fixed item dimensions from it, you can calculate the precise amount of space that needs to be heated.

How Does A System For Underfloor Heating Operate?

The most popular underfloor heating systems are electric and water-based, however there are other varieties as well. The type of underfloor heating system used affects how the heat works.

The fundamental concept of water-based heating systems is straightforward. Warm water is circulated through pipes that are buried in the floor to efficiently heat it.

The floor is much larger than the air, so it only needs to maintain a temperature that is a few degrees higher than the air temperature to provide the warmth required to gradually warm the entire space.

Typically, the entire floor is covered with pipe loops. To a centralized underfloor heating manifold, these loops are connected. After that, a heat source provides hot water to it.

On the other hand, an electric underfloor heating system uses a thin heating wire buried beneath your floor to heat a space. This wire emits heat into the room.

When the power is turned on, the wires generate heat, which then radiates upward through the floor to warm the room. As a result, walking on the floor will make you feel warm.

No matter what kind of underfloor heating system is used, its main objective is to maintain a constant degree of comfort throughout the building by distributing a similar source temperature to all of the floor regions.

Can The Cable For Underfloor Heating Be Extended?

When the system is built, you can lengthen the cables for the underfloor heating if you see that the floor probe is too short. However, a professional should be the only one to do this alteration.

Both lines need to be stretched using a different type of connector, so if you want to do it yourself, you need ask a licensed electrician for precise advice.

By utilizing a suitable twin and grounding cable, the power supply cable can be extended. If required, a bell wire extension can be attached to the floor sensor.

Avoid placing the floor probe or the hot water pipes in draft-prone sections of the floor to prevent the thermostat from malfunctioning.

How Many Amps Is Required For Underfloor Heating?

Small-space heating systems, such those for bathrooms, require one to four amps of power. Your heating system’s amperage draw may reach 4 to 8 amps or even more in some regions.

On the other hand, if the space you’re heating is smaller than 150 square feet, you should use a 120V system. Use 240 V for a system that warms an area larger than 150 square feet.

How Long Should Underfloor Heating Run Each Day?

How To Find The Right Cable Size Needed For Underfloor Heating

This depends on the kind of underfloor heating system you have, how you live, and your preferred level of heat.

In general, you should use a timer to make sure that the heating is only activated when necessary if you want to keep your home warm while minimizing energy waste.

The temperature may be adjusted appropriately depending on who is in the house and what they are doing, but during the coldest parts of winter, an underfloor heating system can be kept in an always-on state for maximum comfort.

Since it can take the underfloor heating system two to three hours to reach the correct temperature, you shouldn’t entirely switch it off.

The underfloor heating system will therefore operate more efficiently and take less time to attain the target temperature if it is left on. Basically, it will take significantly less time for the temperature in your home to reach a comfortable level.

How Big Of A Breaker Do You Need For Underfloor Heating?

It is advised to establish a dedicated 20-amp circuit to supply enough power for a floor heating system.

If you can’t create a dedicated circuit, make sure the circuit breaker in your electrical panel can control the floor heating system.

Can You Cover Underfloor Heating With Concrete?

How To Find The Right Cable Size Needed For Underfloor Heating

Yes, you may add an underfloor heating system to an existing floor and lay a polished concrete floor over it.

Concrete is a great option for ensuring that heat is spread evenly throughout the room because it has a higher thermal mass than other types of flooring.

Concrete floors are a great option for use with underfloor heating systems since they retain heat well.

What Is The Warming Up Time For Underfloor Heating?

It takes some time for an underfloor heating system to warm up. An underfloor heating system can take anywhere between 30 minutes and four hours to attain the appropriate temperature.

This period of time depends on a number of variables, including the rate of heat loss, the surrounding temperature, the degree of insulation in the building and floor, the thickness of the floor, and numerous other variables.

Lack of floor area is one issue that might make it take an underfloor heating system longer to warm up. Additionally, especially with an electric system, heating may be delayed when there is a lot of furniture and poor insulation.

There is a greater likelihood that the room will receive enough heat if there is ample floor space and good heating.

Make sure to inspect your home’s insulation if you can’t get enough heat and find that nothing is wrong with your heating system.


A simple to install underfloor heating system may dramatically increase the temperature of your home.

Use the proper cable size to maximize the performance of your heating system. Contact a professional if you are having trouble figuring out the cable size for your underfloor heating system.

How To Find The Right Cable Size Needed For Underfloor Heating

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Written by HVAC Contributor

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