Wattage Calculator

Underfloor Sizing Guide

Code Size (m) Area (m²) Coverage (m²)
PLUS-KTH33 3 x 3 9 13
PLUS-KTH34 3 x 4 12 17
PLUS-KTH35 3 x 5 15 21.5
PLUS-KTH44 4 x 4 16 23
PLUS-KTH45 4 x 5 20 28.5
PLUS-KTH46 4 x 6 24 34
PLUS-KTH55 5 x 5 25 36
PLUS-KTH56 5 x 6 30 43
PLUS-KTH57 5 x 7 35 50


Installation 2017-06-16T11:56:37+00:00

Installation Instructions

Infrared heating panels do not operate like conventional convection heating where the air is warmed. Instead the panels emit far-infrared, which travels unimpeded until it hits a solid object, which will in turn absorb the infrared and then heat up. Infrared is 100% safe. In fact it actually has proven medicinal benefits!

Somewhat similarly to light though, if the infrared is impeded before it reaches its destination, then the object will not warm up.

As a result, to get the most out of the heating panel it should ideally be fitted in the centre of the room, or if you have a larger area and are getting a number of panels, then they should be evenly distributed in that space. The panels should be above seating areas so as not to have shadowing.


Understanding the positioning of the panels is key to make the most out of heat energy emitted. The panels sold in our energy efficiency shop are designed for all building types whether domestic or commercial, but making sure they are positioned correctly is key to getting the most out of them.

When the panel is positioned on the wall or ceiling, the infrared radiation will travel at 45 degree angles in all directions, hence the distribution area. If they are too close to a wall then you will actually be warming a small concentrated area, which is not ideal since you will be wasting potential useful heat. For this reason it is paramount that you don’t position the panels too close to the walls; rather ‘centre’ them as much as possible.

350watt panels should be at least 0.5m (1.5 feet) or more from the floor – and the larger panels (basically anything over 600watts) should be at least 1.5m (5 feet) away. When the panels are on they will beam the infrared up to 3m(10 feet). If you have higher ceilings, please give us a ring and we can discuss appropriate models to use in this instance.

If you install the panels on the walls, for example if you are targeting specific cold or damp areas, then you should still try and position them as high as possible. Positioning them too low will almost certainly result in objects blocking the infrared, which will limit their heating.


We recommend hardwiring them into an electric circuit where possible. This allows you to use a proper switch (like a light switch) to turn them on. We strongly recommend a professional installation and having the panels ‘hard wired’ into your electrical system by a qualified electrician.

When the panels are turned on, they take about 90 seconds to get up to full heat intensity and since you don’t need to wait for the air to get warm, you should feel their effect very quickly. To stop the panels from overheating, they will modulate and come on and off as required, however we recommend having them installed with some form of thermostatic control to ensure the room doesn’t get too warm.

In terms of the installations themselves we anticipate that most customers will seek the advice and expertise of a qualified electrician who will hardwire the units to a thermostat and the property circuit board. The infrared panels will invariably come with a frame on the back, which allows you to easily attach them to the wall. This does mean that the panels will sit about 1-2 cm off the wall.

Although the panels radiate heat from their front surface (which will get warm), the reflector technology will ensure that there is no heat being emitted out of the back. The fact they are sitting away from the wall also helps in this respect.

Most of the panels that are sold should be supplied with screws and fixings to get the panels attached to the wall or roof. We do recommend getting an electrician to fix them in position though, and hardwire them into one of our RF receivers and transmitters.

You can download the Installation Instructions by clicking the the PDF icon below.