Wavin

An Introduction to Water Underfloor Heating

Underfloor Heating (UFH), already the most popular form of heating in Europe, is a growing trend in the UK. UFH emits radiant heat and is more efficient than radiators, maintenance costs are lower than traditional systems, and not only are rooms more aesthetically appealing UFH is sustainable and could increase the value of your property.

Options for Screeded Floors

For installation on a solid floor slab.

1 Staples
The UFH basic entry level system. It gives you full layout flexibility: You decide the pipe spacing and choice of insulation. It’s especially suitable for small and irregularly shaped floor areas. You will need to allow longer for installation of this system than for System Plates or Pocketed Polystyrene.

2 System Plates
A cleverly designed method for fast placement of UFH pipe but which still gives you full layout flexibility. You decide the pipe spacing and choice of insulation. Vacuum-formed interlocking sheets have integral grips to hold pipe in place. This makes it easy for you to include diagonals and make secure turns in the pipe route. A faster system to install compared with Staples.

3 Pocketed Polystyrene
A real time saving option because it enables you to fit insulation and the base for the UFH pipe simultaneously. Insulation panels have machined channels and screed pockets to grip the pipe. This means the pipe spacing is already set for you at consistent centres. Special end panels hold the pipe turns and insulate the Flow and Return pipe runs for each circuit. Altogether a faster option to install than both Staples and System Plates.

Options for Timber Floors

For suspended floor constructions and fully floating floors.

4 Foiled Polystyrene
Insulation panels with factory fitted aluminium foil diffusers for machined channels that hold the pipe in place. Versions for joisted, battened or fully floating floors available.

5 Modular Chipboard
Tongued-and-grooved chipboard panels with pre-fitted UFH pipe. Enables simultaneous installation of floor deck and UFH over joisted or battened floor.

Also Available - Electric Underfloor Heating

Electric cable mat system ideal for both renovation and new build extension projects. 100W/M² suitable for all subfloors, 150W/M² suitable only for solid subfloors.

Typical Controls & Balancing

Thermostats
May include units for:

• Network (programmable) control

• Individual room/zone control

Unit options: 12V, or 230V mains

Ensure all thermostats are:

• Out of direct sunlight

• Away from heat sources

• Exposed to control area (e.g. NOT in cupboard)

• Approx 1.5m above floor level

SAFETY NOTE: Any installations requiring wiring connection to mains supply should be carried out by a qualified electrician.

Single Zone Control

Water mixing unit, linked to room thermostat, to control flow temperature into a single circuit.

• Connect to primary circuit or existing radiator branch

Multi-zone Control

Via wiring centres, linked to programmable and remote thermostats:

• (12V) Control Centre

• (230V) Control Centre

May include integrated control connections to radiators, towel rail and domestic hot water.

WIRING DIAGRAMS for these control valves are available on request.

For 12V system, suitable cable is required for network accessories (e.g. Thermoboard Master Touchpad control unit) to allow for data transfer.

Cable recommendations:

• For up to 30m runs: Cat 5e

• For up to 100m runs: Belden 9538

1 Start Up

Do NOT start pump until system completely full of water.

• Ensure water from boiler to manifold is above the required UFH flow water temperature

• Open mixing valve for required flow water temperature (see chart in pack) e.g. 5 = 53°C

2 Check Flow Temperature

• Check flow temperature strip on flow (lower) arm of manifold: Adjust by using mixing valve (max. 60ºC for screeded floors)

3 Set Valves

• Note pipe length of each circuit & then locate valve setting chart (included with manifold assembly pack)

• Start with longest circuit: use small straight-blade screwdriver to turn Return valve cone gently clockwise until fully closed - then open it 2 full turns

• To set other Return valves, read down relevant column of chart for longest circuit

• Number of turns from closed is shown, according to length of each circuit

• When all Return valves set, system is balanced. Fit the bases & attach the Actuators

Typical Layouts

Your project may not precisely match any of these examples, but they can help you plan your pipe layout for a UFH installation:

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Parsonage Way
Chippenham
Wiltshire
SN15 5PN

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