Underfloor Heating

[Bazza76]

I am having underfloor heating installed, I have a plan to use a double pole light switch so one side switches the light as normal and the other side switches the underfloor heating, (fed from its own supply) as shown in the diagram, my only concern is that without an external load I might kill the internal resistor, see attached diagram, can anyone see any issues? Thanks in advance

 

[EFLImpudence]

You mean a two-gang light switch. Two pole means a single switch that switches the Line(live) and Neutral.

Surely you should put your switch in the supply to the whole UFH system.

 

[Bazza76]

1 button 2 separate switches on the rear, I don’t want to switch the actual supply to the UFH as it has various other settings which it won’t remember

 

[EFLImpudence]

Ok. That would be a double pole switch.

I don't know how that would affect the internals of the device.


It does seem odd that you only want the UFH to come on when the light is on.

 

[Bazza76]

It’s for the bathroom so I want the fan and underfloor heating on only when I am using it, I’ve seen it done in hotels where it comes in with the light,

 

[EFLImpudence]

The UFH will take quite a while to get warm so you'll probably be finished in the bathroom by then.

Someone else might have some more detailed knowledge.

 

[DetlefSchmitz]

Someone else might have some more detailed knowledge.

 

[ericmark]

The under floor heating in my mothers house took around ½ hour before you could feel any warmth, to reach full temperature was around 2 hours, it was actually a failure, idea was to dry the wet room floor, but it took so long to warm up she left the wet room long before floor had dried.

The internal resistor is to reduce the hysteresis as there is a tendency for the heating to over shoot, and since in parallel with heating mat, makes no difference if mat connected or not.

 

[Bazza76]

Thanks Eric, so my switch should have no detrimental effect, if I find it takes to long to heat up I’ll have to take the switch out, the system is programmable but I don’t generally plan that far in advance