Heating Cables

Heating Cables are ideal for growers using media beds filled with sand or fine gravel for seedling propagation.

The Heating Cable comes with a water resistant thermostat and the cable is then submersed into the bed of fine gravel or coarse river sand.

The grower plants their cuttings directly into this media or they place trays of seedlings on top of the media bed.

The cable heats up to the required temperature and this heat is radiated into the surrounding media and anything that may be growing in the media or on top of it.

The cables are manufactured to very high standards and have a layer of aluminium armour under the PVC insulation which protects the cable and allows for easier installation.

The cable is laid out in a wave formation along the width of the table with a 50 – 70mm gap between each wavelength (to protect the cable from damage).

One 230 Volt thermostat can control more than 1 cable at one time.

The cables are unable to be trimmed shorter if there is a surplus length.

A Residual Current Device should be installed on the mains power supply for the safest operation of the cables.

The heating cable is supplied pre-wired into the thermostat and the thermostat has a 2.85m long power supply cable attached to it with a 3 pin plug for easy installation by the grower.

All pricing below includes 1 x Thermostat

Heating Cable Sizes & Prices are as follows:

Name	Description	Area	Price
100 Watt	10 Metre Long Cable	Suits a 0.6 m2 area	$320.00 + GST
200 Watt	20 Metre Long Cable	Suits a 1.1 m2 area	$360.00 + GST
300 Watt	30 Metre Long Cable	Suits a 1.7 m2 area	$395.00 + GST
400 Watt	40 Metre long Cable	Suits a 2.2m2 area	$447.00 + GST
500 Watt	50 Metre Long Cable	Suits a 2.8m2 area	$499.00 + GST
600 Watt	60 Metre Long Cable	Suits a 3.3 m2 area	$532.00 + GST
700 Watt	70 Metre Long Cable	Suits a 3.9 m2 area	$595.00 + GST
800 Watt	80 Metre Long Cable	Suits a 4.4 m2 area	$635.00 + GST
900 Watt	90 Metre long Cable	Suits a 5.0m2 area	$645.00 + GST
1000 Watt	100 Metre Long Cable	Suits a 5.5m2 area	$680.00 + GST

All pricing includes 1 x Thermostat

Custom sizes and longer cables are also available on request.

Replacement heating cable thermostats are also available for $110.00 + GST.

Sizing and Layout

To size the cable and how it needs to be arranged do as follows:

Work out the length and width of the propagating bed area.

E.g 1.4m x 800mm = 1.12m2

Therefore a 20 metre long (200 Watt) cable is best.

Then divide the 20 metre cable by 1.4m (length of bed) = 14.28. This means you require 15 runs (wavelengths) of cable.

Then divide the width of the bed by 15 runs = 800mm/15 runs = 53mm / 2 = 26.5mm

Therefore you have 26.5mm gap on the left-hand side of the bed and 14 x 53mm gaps between the runs of cable, and a 26.5mm gap on the right-hand side of the bed.

The red part of the cable must be fully covered by sand (if it is exposed or touches another part of the cable it will melt). The insulated black part of the cable that connects to the thermostat can be exposed.

45mm gaps between the wavelength runs of the cable is the very minimum you can go to.

55 -70mm is ideal.

There must be a minimum of 25mm of sand on the floor plate of the table onto which the cable is laid.

A sheet of polystyrene minimum 25mm thick installed on the base of the table would help to insulate the table and improve heat retention.

Then there must be a minimum of 50mm of sand on top of the cable. The cable must not be exposed at any time.

The sand should be kept moist at all times to help to conduct the heat.

One thermostat can only handle 2 x cables at any one time.

Please talk to Pure Hydroponics for pricing and further information.