bought some under floor heating and it states a 16amp mcb is required but looking at the power output it is only 750watts will I be ok with a 6amp breaker? my calculations are saying a 6 amp is ok but wondering why the instructions are stating 16 amps?
Under floor heating
- Thread starter wayneward25
- Start date
How big a room are you going to be able to heat with 750W?
Are you aware that the installation of UFH is notifiable?
Are you aware that the installation of UFH is notifiable?
It is always advised to follow the manufacturers instructions.
So what model type is it and what do the instructions actually tell you to do?
the instructions state there is enough to heat 5 sqm with a sqm metre using 150 watts, im not using the under floor heating to heat the room its already got a radiator and towel warmer in there,
i appreciate its advisable to follow the manufacturers instructions but surely its better practise to use a lower rated mcb where appropriate
Is there nothing in the instructions about a Switched Fused Connection Unit and 5A fuse and/or Double-pole Switch with 3mm. separation etc.?
it says you can use a fused spur on an existing circuit but the other circuits are not rcd protected and only mentions a double pole switch for larger installations
With which sized fuse?
still mentions 16 amps
13A is the maximum in a fused spur.
The fuse/mcb is there to protect the cable, not the appliance, so if the manufacturer says 16A then no advantage would be gained by fitting anything lower.
The fuse/mcb is there to protect the cable, not the appliance, so if the manufacturer says 16A then no advantage would be gained by fitting anything lower.
so what would u recommend its easier to install it straight to the board with an mcb rather than feed the cable through the wall for a fused spur
I think it would still be advisable to have a double pole switch, preferably fused.
I would advise contacting the manufacturer.
The instructions, as reported, don't seem logical.
I would advise contacting the manufacturer.
The instructions, as reported, don't seem logical.
it says the thermostat is rated for 16amps max
so can anyone see a problem with a ufh system on its own circuit with a 6amp mcb rcd protected, with a thermostat that is rated at 16 amps max and ufh cable producing 750watts?!?!
That would suggest the MI is saying that the product is is restricted to a maximum of 16Amps. If you had a link to the product it would be helpful.
Generally speaking the output per sqM of floor heating is recommended to be about 150-200W.
You still will require RCD protection and building notification as it a special installation.
If you use a RCBO on dedicate circuit, should be fine, you must conform to permitted cable routes within walls and floors though, the circuit should be inspected and tested and documented in-line with part 6 of BS7671 and still requires notifying.
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