Combi boiler external controls help

Oct 03, 2006 7 Replies
J

Looking to fit an external controller for my recently fitted boiler, but am a little confused as to which one to use/choose.



They seem to be categorised into "programmers", "timeswitches", and even "mini programmers" (according to

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but some apear to belong to more than one category.



Could someone please care to explain the difference? BTW, I am looking for one that can do 5/2 or 7 day, 1 hour override, holiday mode, single channel,



3 on/off per day. I have a 3 c+e 2.5mm cable running from the boiler to the position where the controller is to be fitted.

Many thanks in advance.


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J

You may find that a programmable room stat is a simpler solution. Something like:

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cease needing to worry about on/off cycles etc and just tell it the temperature you want at various times during day.

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J

Thanks for that. However, it is a pretty big house, and I don't want to have to have to rely on one central thermostat. Each radiator has its own TRV, so I just want to be able to control On and Off times.

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C

What are you using for the boiler interlock? Do you have one room with a room thermostat? Do you have a flow switch instead? Some other method?

I presume you haven't subzoned?

Christian.

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D

2.5mm? Never seen that in triple and earth. 1mm should be fine.

My choice would be the Horstmann H17XL.

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J

Well it does that as well, and the TRVs can still do their stuff. It does provide a boiler interlock (i.e. turns it off when the house is up to temperature (and the boiler would otherwise be trying to force water through a bunch of mostly closed TRVs)

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E

Agreed this control (I've fitted around 50 units) does exactly what you want.

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J

Thanks for that - just ordered one.

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