Invisible Heating Systems - Underfloor heating, ground source heat pumps, solar & renewable energy systems
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Add-On Kits

If you're building a new conservatory or small extension, you may wish to consider one of our IHS Add-On Kits to add on or link up to your existing radiator system. 

 IHS Underfloor heating add-on kit bundle

Available Kits

Conservatory or rooms with large glazing areas
floor area spacings manifold groups kit no. price (ex VAT)
18m2 150mm IHSC x 1 1 AD1 £599.00
36m2 150mm IHSC x 2 2 AD2 £799.00
52m2 150mm IHSC x 3 3 AD3 £1099.00
Other areas
24m2 200mm IHSC x 1 1 AD1 £599.00
48m2 200mm IHSC x 2 2 AD2 £799.00
70m2 200mm IHSC x 3 3 AD3 £1099.00
clockstat/boiler relay £70.00
All prices include carriage, exclude VAT


Each Kit Includes

  • Self-regulating manifold with Grundfos UPS pump, regulating valve, safety stat, stopcock, temperature gauge and mounting kit
  • Available in 1-3 groups
  • 1, 2 or 3 rolls of 125m standard 16mm IHS PE-RT pipe
  • One roomstat
  • Tie wires, staples or screw-in clips depending on floor construction
  • CAD drawing (where practical)
  • Delivery on UK mainland


Technical Advice

When measuring up the area to be heated, make an allowance for areas that don't require heating eg. underneath kitchen units and baths. Typically, allow a depth of .6m for kitchen units, 1.5m² for baths, 1m² for showers and .25m² for toilets but it's important that you measure these areas yourself. To illustrate this, 8m² of bathroom with bath, shower and toilet require a total area of 5.25m² to be heated.

When installing an add-on kit with an existing radiator system, the flow and return should be taken from as close to the boiler as possible and in any case after the system pump.

If you need independent time control, please contact us.


Regulating Valves

Concrete and screeded floors require 50 degree regulating valves to enable drying out of the concrete.  A temperature that's higher than 50 degrees could crack the concrete.

For joisted floors, we can supply a 70 degree regulating valve as joisted floors require a higher operating temperature.

Please ensure you order the correct regulating valve with your Add-On Kit or speak with a technician.

Please contact us with any further questions you may have.