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surreysparks

Pricing a rewire where they want underfloor heating, through out the whole gaff.

This equates to over 70 amps.

Is there a simple way to bring to demand down, like some how controlling that the upstairs and downstairs cycle seperatly etc
 
Yes they are called themostats, generally fitted in each room controlling the heating in that room in this kind of set up.
And our old friend diversity might be allowed to come out to play.
 
Yes they are called themostats, generally fitted in each room controlling the heating in that room in this kind of set up.
And our old friend diversity might be allowed to come out to play.

Yeah but i mean using a contactor or something so that they all wouldnt demand power at the same time.
 
I wouldn't worry about them using them all together - once they've got the first quarterly bill they will turn them right done of off completely.

70 amps - how big is the gaff?
 
I wouldn't worry about them using them all together - once they've got the first quarterly bill they will turn them right done of off completely.

70 amps - how big is the gaff?



over 120 sq m upstairs and downstairs, im thinking about telling the builder to go for a wet system, rather than telling them they cant cook when the heating is on lol
 
Have you worked with underfloor heating systems before? The thermostatic controls work by maintain the floor at a set temperature by turning the element on and off like a normal thermostat so not all of the elements will turn on at the same time. They don't ever let the floor cool down completely as when the 'off' periods are active they merely maintain a lower temperature. So once the system is up and running you won't get it all on at the same time.
Use your training and good judgement to assess the diversity applicable and hey presto plenty of room for cooking, especially when most cookers come out at a lot less than 30 Amps after diversity.
Most underfloor heating companies will happily come out and design the install for you and you can get advice form them about applicable diversity.

And by the way you don't just tell the builder to install something else, YOU don't call the shots on what your client wants installed after all they will be paying the bill and having to live with it. You can advise them that a wet system might be a better alternative and explain your reasoning so that they can understand what is going on, don't forget they might be checking everything you tell them on forum like this!
 
Have you worked with underfloor heating systems before? The thermostatic controls work by maintain the floor at a set temperature by turning the element on and off like a normal thermostat so not all of the elements will turn on at the same time. They don't ever let the floor cool down completely as when the 'off' periods are active they merely maintain a lower temperature. So once the system is up and running you won't get it all on at the same time.
Use your training and good judgement to assess the diversity applicable and hey presto plenty of room for cooking, especially when most cookers come out at a lot less than 30 Amps after diversity.
Most underfloor heating companies will happily come out and design the install for you and you can get advice form them about applicable diversity.

And by the way you don't just tell the builder to install something else, YOU don't call the shots on what your client wants installed after all they will be paying the bill and having to live with it. You can advise them that a wet system might be a better alternative and explain your reasoning so that they can understand what is going on, don't forget they might be checking everything you tell them on forum like this!
and theres more as well:
as heat rises it would be sensible to assume that the upstairs will benefit from this....and thus will be on for considerably less time...
 
Electric underfloor heating is only good for one thing: heating up the floor.
In my opinion, and experience, it is not good to provide space heating. And much less good if you bung carpet on the top.
As above, I would go for wet underfloor heating.
 
Don't forget its also good for causing mysterious RCD tripping which occurs randomly as the fault only occurs when it reaches a certain temperature. With the resultant job of installing a good old dimplex panel heater because they don't want their fancy laminate ripped up.

I agree that wet systems are much better but it isn't his call to make, the best he can do is advise the client.
 
I also recommend thermostats procedure, as it controls heating for both upstairs & downstairs. Go up with this, electric underfloor heating is good as it maintains the temperature range. I would go for wet underfloor heating and not space heating.
 
after getting his 1st leccy bill, he'll switch it all off and nip down to the oxfam shop for a couple of woolly jumpers.
 
Yeah but i mean using a contactor or something so that they all wouldnt demand power at the same time.

Not quite sure how using a contactor would achieve this...

I'd go with the above recommendation that the builder/client gets a Company to do the design and pricing, based on the available supply, then you can install to their specifications. Why have all the added responsibility of providing a system which imo is a waste of time, and which the customer may not like ?
 
Its an interesting to hear the what people think of electric UFH - as an installer i think it works well - yes electric heating is more expensive to run than Gas, but its cheaper than oil and lpg.

Im just installing 380m² of electric UFH in a whole house ATM, think about those bills then.
 

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