Wet Underfloor Heating

What floor finish is suitable for wet underfloor heating?

Most floor finishes are suitable for underfloor heating but to ensure you get the best output we would recommend the flooring has the lowest thermal resistance possible, in the case of carpets we would recommend the combined rating of the carpet and underlay is less than 1.5 TOG and with wood flooring we would recommend the use of engineered wood rather than solid wood if possible. If there are any doubts about maximum floor temperatures, Gaia would recommend checking with the flooring manufacturer to ensure that there are no temperature limits on the flooring.  If there is a maximum floor temperature limit, then the heating can be limited by either adjusting the flow rate or installing a floor sensor

Why has the pressure dropped on my manifold?

The most common reason for this is air entering the system from the boiler.  However, Gaia would recommend using the services of a plumber to investigate as there may be many reasons for this happening

The pump on the manifold is running but the manifold is cold

Gaia would recommend getting an electrician to check the wiring to the wiring centre as it may not be wired correctly to switch the boiler on

My heating should be on but the pump on the manifold is not running

Firstly, check that at least one thermostat is turned up and calling for heat, if this is the case but the pump is still not running then it is recommended to get an electrician to check the wiring to the wiring centre as it may not be wired correctly to switch the pump on

My room isn’t warming up even though my thermostat shows it is on

As wet underfloor heating is typically installed within a screed, the system can take some time to warm up after the initial install or if it has been off for some time. If this is not the case then you can check that the pump and boiler are running, if they are not running then an electrician or plumber would be required to look into this further.  If the pump and boiler are running but the room is still not getting warm then you should check to see if the thermal actuator is opening up to allow water to flow into the pipework within the room that requires heating

What is the maximum pipe length for a single loop of pipe?

The maximum length of 16mm pipe Gaia would recommend installing as a single loop is 120m due to pressure drop and temperatures

What pipe diameters are available?

The typical pipe diameter used on Gaia systems is 16mm although other sizes may be available upon request

What manifold sizes are available?

Gaia Manifold sizes are as follows:

2 port = 164mm

3 port = 214mm

4 port = 264mm

5 port = 314mm

6 port = 364mm

7 port = 414mm

8 port = 464mm

9 port = 514mm

10 port = 564mm

11 port = 614mm

12 port = 664mm

All sizes stated exclude pumpset (130mm) & isolation valves (70mm)

What is the maximum loops available on a single manifold?

All Gaia manifold sizes are between 2 – 12 ports.  If more than 12 loops of pipe are needed then multiple manifolds will be required

What heat sources can I use for wet underfloor heating?

Underfloor heating is extremely effective with low temperature heat sources such as Ground Source & Air Source Heat Pumps; although almost any heat source can be used as a mixing valve, which can be used to cool the water down to the required temperature (Typically 35 – 55°C).  The heat source will need to be known before the system is designed, as lower flow temperatures will require the pipework to be installed closer together.

What output can I expect to get from wet underfloor heating?

There are many factors that affect the output of the underfloor heating system (outdoor temperature, required indoor temprature, floor finish, flow temperature). For a screed system, and based on standard requirements, the heat output will usually be around 70W/m² based on flow and return temperatures of 50/40°C, a design room temperature of 20°C, an external temperature of -3°C and a floor thermal resistance of no more than 0.1W/m²K (1 TOG carpet)

Can I put a rug on my floor?

Gaia would recommend rugs are avoided on temperature sensitive floors such as wood and vinyl as the heat will get trapped under the rug and can cause damage to the flooring.  Rugs aren’t such an issue on tiled floors as they typically aren’t temperature sensitive however Gaia would recommend caution with the type of rug as the heat can still get trapped underneath and may damage the rug or the heating

Do I need a floor sensor?

Floor sensors can be installed with hydronic underfloor heating systems if floor temperature limits are required; however, the floor temperature can typically be limited using the flow rate on the manifold

I turn on one thermostat in one room but another room in the house heats up instead

This indicates a possible wiring or control issue with the system.  It is recommended that an electrician checks over the wiring as it is highly likely thermostats are linked to the wrong thermal actuators on the manifold

My manifold is noisy, what could be the issue?

If the system is noisy it may be a build up of air within the pipework from the boiler.  In this case, Gaia would recommend a plumber to attend, enabling them to diagnose and resolve the issue