Should I have a Room Thermostat fitted on my System?

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In 2004, my local gas engineer fitted a Chaffoteaux & Maury Combi Boiler in my parkhome (20' x 25' twin unit size) as a replacement for my old Baxi back-boiler. At the same time, he fitted TRVs to all (6) radiators, except for the one in the bathroom, and disconnected the Room Thermostat claiming that the heating could be controlled using the Boiler switches and setting the TRVs.

However, when the heating is on, the boiler seems to be forever 'cycling' whether I have the heating on high or low and this does appear to be an inefficient - and expensive - use of gas. Subsequent annual checks by an assortment of gas engineers from a local Heating Engineers do confirm that, at the time of fitting, a Room Thermostat was not essential and the best way to get my TRVs working efficiently is to turn the Boiler Heating control fully on and then set the TRVs to suit my requirement in each room. This results in a sizzling hot bathroom radiator (remember - no TRV) and still the constant 'cycling' of the Boiler. In my mind, still an unnecessary use of gas.

This does seem to me (just a novice paying the gas bill) an incredible, expensive, inefficient way to operate a gas boiler and so, I return to my Topic Question - should I have a Room Thermostat fitted on my System? If so, where should it best be fitted given that the only radiator without a TRV is in the bathroom?

Thanks in advance for any and all help and assistance.

So sorry to be long-winded but it is the only way I can explain my situation to someone.
 
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I'd want a room stat. Yes the bathroom radiator acts as a bypass, but if the room is warm enough and every room is warm enough (and the TRV's have shut down each radiator), then for the boiler to keep on cycling is wasteful.
 
it is now part of the building regs that a room stat must be fitted & wherever it is fitted the rad must not have a trv (or the head removed), most people fit them in the hall & take the trv off (or the head) on that rad
 
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It is NOT now part of the building regs that a room stat must be fitted what it asks for is an interlock and depending on boiler this can be achieved in other ways.
 
It is NOT now part of the building regs that a room stat must be fitted what it asks for is an interlock and depending on boiler this can be achieved in other ways.

yet another thing you know nothing about
 
It is NOT now part of the building regs that a room stat must be fitted what it asks for is an interlock and depending on boiler this can be achieved in other ways.
I think you may not be up-to-date. The Domestic Buildings Compliance Guide 2010, page 23, Table 2, Section 5, says that a room thermostat or programmable stat is required in each zone.
 
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Yup room stat needed will stop what's called short cycling uses more fuel and wears out boiler probably why he didn't fit one looking for job in about6 years
nemo mortalium omnibus horris sap it /mortals are not wise at all hours
 
You gas engineer is an idiot.

You need a wall thermostat and he should have fitted one.

They only cost £10.

Don't know where he picked up a boiler like that as far as I know they don't
even sell them in the UK anymore.
 
cbf and d halisham try reading page 22 of the same document.
A BOILER SHOULD HAVE AN INTERLOCK.
And as i have said there are other ways of providing an interlock other than using a room stat
controling zones is something completly different

So CBF GO on enlighten me how i dont know what i am talking about or are you not intelligent enough to know how boilers can be controlled other than with a room stat.
 
A BOILER SHOULD HAVE AN INTERLOCK.
I didn't disagree with that - I know what the Guide says about interlocks. I was disagreeing with the first part of your statement:

It is NOT now part of the building regs that a room stat must be fitted
That is factually incorrect. Room thermostat's ARE required.
 
How can you not agree that it is an interlock that is required then say it is a room stat that is requred .
Roomstat is only mentioned in regards zoning.
where does it say a room stat is a must and ARE required ??
 
To save this going backwards and forwards a system can legally be fitted with one zone so trvs and flow switch is within what the regs actually ask for as in an INTERLOCK is required.
 
How can you not agree that it is an interlock that is required then say it is a room stat that is required.
You need BOTH!!; though they may be combined in one piece of equipment.

Roomstat is only mentioned in regards zoning. Where does it say a room stat is a must and ARE required ??
You have answered your own question: in the section on zoning. Even if you have only one heating zone, you must still have a room stat to control the temperature in the zone.
 
No you dont need it for one zone you need it for zoning ie zones plural .
 

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