I need some advice regarding the connection of an electric underfloor heating system to the main circuit.
The plan is to lay a 200w system under the tiles of a 30cubic metre conservatory and expect to connect this through a single thermostat and contactor to the mains.
I will employ a qualified electrician to do the electrical installation, but at this stage I am seeking advice because I am getting conflicting views from the builder and floor tile supplier regarding how the connection can be made and a different view on the maximum size (wattage) of system I can lay. The builder is being conservative and suggests a low powered option connected to the consumer unit (through the thermostat only).
The heating system is quoted within the total build which the builder will install. Investment in materials is high and so to is the risk of getting an useless heating system. I therefore need to make sure that the buldier's advice is correct so that if needed I can make arrangements to employ an independent electrician for the electrical installation and leave the builder to lay the heating mat etc, or be better informed to instruct the builder.
A factor in the builder's advice is that the current consumer unit (11way) is full (house, garage, external building etc) and he seems to plan to connect the system to the ring main.
Questions therefore are:
1. Would my ideal system connected through a contactor be realistic?
2. How would this contactor be connected to the consumer unit (are bigger units available to accommodate the use of the contactor, can a separate housing unit be connected to the consumer unit etc)?