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Friday, 2017-02-24
Floor Heating

Underfloor heating with electric cables

A comfortable and simple way of heating a house. No maintenance - only a timer and /or thermostat to control the usage of electricity. It can be used in conduction with other ways of heating to give a comfortable surface temperature of the floor-surface. Night-tariff could be used to minimize the costs per used kWh. The installation costs in a new house are lower than for any other system. The drawback is of course the dependency on electricity. This could be justified in a small and highly insulated house where the amounts of electricity used would be small. Another usage is to use electric floor heating initially after a new house is built until a more ecological and costlier system of heating is installed.

HEAT RISES
This simple fact explains why DEVI floor-heatcables provides more comfortable warmth than alternative radiator systems. A radiator system throws heat up at head height which then travels further up to the ceiling only to travel downwards and return as a cold draft around one's feet. DEVI underfloor heating on the contrary, provides appropriately pleasant warmth for your feet, body and head. As it produces only very gentle air circulation, the amount of travelling dust particles is reduced considerably which naturally is a great relief for people with allergies or asthma.

UNDER ALL SORTS OF FLOORS
DEVI floor-heating system can be used anywhere in the house, regardless whether the floor is constructed with floorboards on joists or wood-laminates or massive parquet on concrete supported by joists. Under all circumstances it is important that the floor is well insulated below to ensure the best heating comfort and most economical result. In low-energy houses the installed heating effect is usually lower than 50w/m2. This low effect eliminates all problems with overheating.
Wood is a natural material which contracts or expands depending on the temperature. This puts demands on a floor heating system to distribute the heat in a gentle and controlled way. Usually the wooden floor manufacturers prescribe a max. temperature of 27° which must not be exceeded.


CONTROLS
Devireg™ 540/550 series of controls are dual function thermostats. They control the heating system with a combination of temperature and the programmed timer. This gives an energy saving system, which provides the most optimal comfort.
o The Devireg™ 540 has a normal built-in timer and built-in room sensor and a floor sensor.
o The Devireg™ 550 has an intelligent built-in timer and a built-in room sensor and a floor sensor.
In low-energy houses the installed heating effect is lower than 50w/m2. This low effect eliminates all problems with overheating. In such situations a simple timer can be used to control the cable(s).

ELECRO-MAGNETIC FIELDS AND HEALTH ASPECTS
Are there harmful electro-magnetic fields? All electrical equipment and installations have electro-magnetic fields (EMF). Measurements of EMF from floor-warming system show values far below the hygienic limit values established. As example, it is ten times less from a floor with heating cables than from the monitor of a PC.
Furthermore, DEVI™ systems for room heating are delivered standard as twin-conductor cables where the conductors are 'neutralizing' the EMF down to a further 10% of the already very low value.

Is it healthy with a floor-warming system? Yes, the floor-warming systems are clean and healthy because the heat flows up from the floor instead of air being circulated in standard radiator system.
It is good for allergies and recommended by the Asthma Foundation in several countries.

LIFESPAN OF CONCIELED CABLES
What is the lifetime? DEVI™ has been producing heating cables for around 40 years and there have been no cases, to the best of our knowledge, of a system malfunction due to aging.
The lab simulations suggest a lifetime of at least 50 years. Basically, we can say that the heating cables embedded in concrete will last at least as long as the normal hidden electrical wiring in a house.

DEVI DTIP Technical Specifications
Cable construction
Rated voltage
Watts per meter
Diameter
Conductor insulation
Sheath
Rated temperature
Approval
Pulling strength
Deformation strength
Warranty
Twin conductor
230V
8, 10, 18 W/m
7.0 mm
PEX
PVC 90i
65iC
IEC 800/Demko/CE
200 N
2000 N
10 years
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