in , , ,

What You Need To Know About Underfloor Heating: How Far Apart Should The Pipes Be?

What You Need To Know About Underfloor Heating: How Far Apart Should The Pipes Be?

To guarantee that the system is adequate for the space that needs heating, an efficient underfloor heating system is essential. A successful underfloor heating system depends on the heating pipes being spaced correctly apart.

How far apart should the pipes for under-floor heating be, though? No more enigmas! We looked into this issue thoroughly, and the solution is shown below!

In general, it depends on the size of the pipe you use and the amount of floor space you have available. However, the recommended distance between underfloor heating pipes is between 100 and 300 millimeters, or 12 inches.

For An Underfloor Heating System, What Pipe Is Best?

Since the underfloor heating system requires specific pipes that can withstand destructive factors in this sort of installation, choosing the right pipes can occasionally be fairly difficult.

There are several different underfloor heating system pipes on the market right now. This comprises PERT, PEX, and PEX-AL-PEX. Because these pipes are primarily made of polythene, they are best able to withstand corrosive substances.

These pipes are perfect for your underfloor heating system since they can tolerate extreme tensile stress.

These pipes are perfect for your underfloor heating system since they can tolerate extreme tensile stress.

The Importance Of Pipe Size In A Heating System

It’s critical to choose the right pipe size for system performance and home comfort. This is due to the fact that the diameter of the pipe has a significant impact on the hot flow rate of water and its overall heat creation.

Because they provide more hot water in a given period of time during the process, larger tubes provide more heat per square foot of your floor than smaller pipes.

What Size Of Pipe Should Be Used For Underfloor Heating?

Choosing the proper pipe size is crucial and indispensable. This ensures that the area where the heating system operates gets an adequate amount of heat.

Its maximum run length is likewise determined by the appropriate pipe size.

The recommended pipe diameter and the maximum length are listed below:

  • 300 feet at1/2 inch of pipe diameter is sufficient.
  • 500 feet at 5/8 inch.
  • 500 feet or higher: 3/4 inch.

Additionally, the maximum length of smaller pipes is less than that of their wide-diameter counterparts with equal capacities. Therefore, a large space could require a wider pipe to ensure complete coverage of your floor surface.

What Kinds Of Underfloor Heating Systems Are There?

Radiant heating systems come in three different categories. This comprises electric radiant floors, hydronic radiant floors, and systems for radiant air heating.

Radiant Floor Heating Using Air

What You Need To Know About Underfloor Heating: How Far Apart Should The Pipes Be?

Since radiant air heating floors are expensive to build and incapable of successfully storing large amounts of heat, they are rarely employed in residential settings.

Although it can be used in this setting, solar heating is still ineffective at night.

Electric Radiant Floor Heating

What You Need To Know About Underfloor Heating: How Far Apart Should The Pipes Be?

Electric radiant flooring is often made comprised of electric heating cables that are incorporated into the floor. Under a floor covering like a tile, there are alternate systems with electrical matting.

Typically, a high thermal mass, such as a thick concrete floor, is required for electric radiant systems to be practical.

Hydronic Radiant Floor Heating

What You Need To Know About Underfloor Heating: How Far Apart Should The Pipes Be?

For climates where heating is a significant factor, hydronic systems are the most popular and effective radiant heating systems.

Systems with hydronic radiant floors use pipes beneath the floor to circulate hot water in a pattern.

A boiler is required for this process in order to move the hot water beneath your floors. Zoning valves, pumps, and thermostats may be required in some systems to regulate the amount of hot water that flows into each tubular loop.

These systems can be classified into two categories, primarily wet and dry installation. The heat produced by a solid concrete surface is used by the wet type.

Is Underfloor Heating Better Than Radiator?

For residential and commercial contexts, switching from radiator heating to underfloor heating is advantageous. The biggest benefit of adopting underfloor heating is that it consumes less energy than radiators to operate.

In comparison, radiators are much smaller equipment and require more heated water to function as effectively as underfloor heating does. Heat is generated by radiators and sent upward, where it cools and returns to the floor.

As a result, it creates cool spots and heats unused ceiling space, neither of which are really needed. The requirement for heating is evenly met by using an underfloor heating system. Additionally, you can reduce your annual power costs by 15%.

For Underfloor Heating, How Many Ports Am I Going To Need?

Well, it always depends on how much space you have to work with. If you’re building for a tiny project or one room. For your underfloor heating (UFH) system, your manifolds must have 12 ports.

The UFH system typically features a manifold with two to twelve ports. To perform flow and return functions, it is attached to a pipe. This controls how warm water circulates over the UFH zones’ whole floor.

The fact that manifolds only require a small number of fittings to connect the pipe speeds up installation.

How Can Underfloor Heating Be Installed More Efficiently And Effectively?

For a project to be effective and high-quality, a number of variables must be present, and installing underfloor heating is no exception.

To avoid expensive repairs, it’s always important to think about and take care of these factors as soon as the installation is complete.

The finest advice we have listed below will help you achieve maximum system effectiveness:

Observe Appropriate Floor Base Insulation

Before installing the manifold or pipes, make sure the required amount of insulation has been applied to the subfloor of the floor. To stop heat loss and guarantee effective operation, the system needs to be insulated.

According to the Building Regulations, new construction must employ insulation that is at least 100mm thick.

Plan Where To Place The Manifold

The manifold’s location in any UFH system is essential. It is highly recommended that you place it underneath the bathroom sink or the kitchen cabinet.

But positioning the manifolds in the centre of the building is also a wise decision. Because the pipes need to be shorter overall, less time and material are required for installation.

Additionally, shortening pipe lengths improves the efficiency of your boiler unit. Consequently, your home will have a consistent distribution of heat throughout the night.

Follow The Manufacturing Guidelines

Your best course of action should always be to abide by the manufacturer’s recommendations and instructions. Keep in mind that the business did not set proper underfloor heating system installation as a standard by accident.

Try Not To Install The Pipe First

Installing the manifold initially is the best course of action. Next, take a circuit by circuit route from the flow to the manifold’s return.

To know which location the circuit leads to, it is essential to label each line on the manifold.

Prevent Airlocks

Before laying the screed, you must pressurise the system and inspect the plumbing once the pipes have been installed. This makes sure that there are no air bubbles left in the pipe of the system.

Installing an Auto Air Vent (AAV) on the manifold will help to empty the system and stop air from building up.

Include Anti-Freezing Agent

If the piping is left outside in the cold during the winter, it can freeze. The pipe may get weaker as a result and shatter or leak sooner rather than later.

As a result, this could be disastrous, so it’s better to avoid any potential problems than to regret them afterwards. Propylene glycol is a non-toxic fluid that works well to keep your UFH system from freezing up. So, use it as necessary.


The underfloor heating system can operate more effectively and efficiently with the right pipe spacing. Additionally, this straightforward but important procedure will stop serious issues from emerging over time.

The best pipes to use in your UFH system are covered in this article. Additionally, you are aware of the required pipe diameter sizes for a given area. We also give you some advice on how to improve your UFH system.

What You Need To Know About Underfloor Heating: How Far Apart Should The Pipes Be?

What do you think?

Written by HVAC Contributor

Leave a Reply

Your email address will not be published. Required fields are marked *

GIPHY App Key not set. Please check settings

7 Most Efficient Heaters For Damp Rooms: What You Need To Know

7 Most Efficient Heaters For Damp Rooms: What You Need To Know

How Good Are Duct Booster Fans?

How Good Are Duct Booster Fans?