Underfloor Heating

Technical Specifications / Heating

Before fitting Warmup® Underfloor Heaters there are several considerations you must bear in mind with regard to heat:

• Will the underfloor heater be the main heat source in the room?
• Are you aware of how much time your floor will take to heat up?
• Have you checked out the running costs/power consumption?

HEATING CAPABILITIES:

Warmup® Underfloor Heating System can be used as the only heat source in rooms that comply with insulation levels set out in current building regulations and where 100% of the floor area is covered by the heating system.

In rooms (such as bathrooms or kitchens) where the entire floor is not covered, or in rooms where the heat loss is very high (such as conservatories), additional heating may need to be installed.

A heat loss calculation should be preformed to determine exactly the amount of heat required to heat the room.  Then, by measuring the area to be heated and using the table below and the price list, you can calculate whether additional heating is required.

Heater	kW output per heater
DWS300	0.300
DWS400	0.400
DWS600	0.600
DWS800	0.800

 

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RUNNING COSTS/POWER CONSUMPTION:

Power consumption, and therefore running costs, of a Warmup® Underfloor Heating System is directly related to the heat-up time.  The longer the system takes to heat-up, the less responsive it is and the more it will cost to run.

Example - Heating 3m² of floor, twice a day for two hours each time in a bathroom fitted with an insulation board on a concrete subfloor, will cost approximately £0.05/day*.  Running the same system on an un-insulated concrete subfloor will cost approximately £0.10/day**.

* assumes the heater will be on 40-60% of the time once up to temperature.
**both cases assume a cost per kW of £0.065

Check with your local power supplier for current unit costs in your area.

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HEAT-UP TIMES:

Heat-up times depend on such variables as the thickness of the tiles and the design of the subfloor.

Subfloor construction	Heat-up time
WBP Plywood on timber	1 hr
WBP plywood with insulated tile backer board - 10mm	0.5 hr
Insulated concrete - insulation under screed	2 - 5 hrs
Un-insulated concrete	2 - 8 hrs
Concrete with insulated tile backer board- 10mm	1 hr
Concrete with insulated tile backer board - 50mm	0.5 hr

 

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LAYOUT:

The Warmup® Underfloor Heater is versatile allowing you to heat your room using different wire configurations to suit the particular layout of the room.  The Warmup® Installation Manual provides a useful guide to heater layout, however it may be necessary to alter this slightly to suit your particular installation.  In any case, spacing between the wires should NEVER be less than 50mm.

Multiple Underfloor Heaters:
Before installing, ensure you have the correct number and size of heaters for the area you wish to heat.  You may wire a maximum of four DWS800s (25m²) through a Warmup XSTAT Thermostat with the heaters joining in parallel at the thermostat.

When laying more than one heater it is important to remember the following:

• The heating wires must not touch or cross at any point.
• The heaters are joined in parallel only at the thermostat or in a junction box.  DO NOT attach one heater to another in series.
• The heating wire spaces for all heaters in an area should be approximately equal.

Areas in excess of 25 square metres:
If the area to be heated exceeds 25m², then you must install Warmup® Underfloor Heating using multiple thermostats.