adding room stat to system plumber says not a good idea

currently the system i have only allows control of hot water and heating via the boiler vokera 14se

i can turn off the heating in the hot press by turning lever

ideally i would like to be able to control heating on both floor levels but to do this plumber says entire system would need to be replumbed, my feable knowledge was that a 2 port valve would need fitting in hot press to allow this...... maybe not

kind of get impression he wasnt too interested in anything labour intensive

anyways he fitted TRVs on all rads except bathroom and added a cylinder stat and while doing this added another bypass valve incase bathroom gets done away due to attic conversion currently in pipeline

when i asked about putting a room stat in main area downstairs he said not a good idea as essentially this would overide all the heating in the house

was looking at getting this
http://www.heatmisershop.co.uk/products/Programmable-Thermostat-%2d-Heatmiser-PRT.html

i know its hard second guessing somebody without seeing system but i have been in houses with TRVS and seperate room stats also

hard to say without looking at the system but for zoning you would need a dedicated flow and return for that area.

You don't have or need a room stat in any room with TRVs fitted.

A programmable room stat in the lounge, and not TRVs is a good plan, as would zoning it parts of the property are not fully occupied, but that would require re jigging a lot of pipework.

TRVs are the easy way out, and cheap.

Programmable room stat would be best, but installation would be much higher.

Hope that helps.

What about the honeywell CM zoning kit, Expensive i know but does away with all the floor boards up and stuff.. effectively you make every room a zone as the TRv head comes on at your set points and is controlled form an external controller which is RF.


There should be no need to drain down either to fit the CM kit as honeywell claim the head fits all (if you buy there conversion kits)

this http://www.heatingcontrolsonline.co.uk/honeywell-zone-installer-pack-p-216.html

pricey isnt it

beolight said:

i can turn off the heating in the hot press by turning lever

Click to expand...

Can you put on a pic showing the pipe work in your hot press (aka airing cupboard)

i would like to be able to control heating on both floor levels but to do this plumber says entire system would need to be replumbed, my feable knowledge was that a 2 port valve would need fitting in hot press to allow this.

Click to expand...

If you want to control both floors from one thermostat you will need one valve. But if you want to control each floor separately you will need two valves.

he fitted TRVs on all rads except bathroom

Click to expand...

Don't know what the regulations are in Ireland, but in the UK there has to be a boiler interlock, i.e a method of turning the boiler off when the house is up to temperature. TRVs do not do this, you need a room thermostat.

added a cylinder stat

Click to expand...

What does this control?

when i asked about putting a room stat in main area downstairs he said not a good idea as essentially this would overide all the heating in the house

Click to expand...

Only if the room stat is set to the wrong temperature or located in the wrong place. You should never have a TRV in the same room as a Room stat, as they will conflict. Set the Room stat higher than the TRV and the stat will never shut the boiler off; set the stat lower than the TRV and the TRV will never work. If you put the room stat in an area which takes longer to warm up, the rooms with TRVs will get up to temperature first, so the TRVs will work, the room stat will then shut off when that room reaches temperature.

the basic problem with TRV's and roomstats when fitted together has always been the same, lack of understanding on the part of the homeowner and lack of information from the installer. TRVs were originally designed to operate independently of any other controls besides clocks, each TRV could then open/close allowing hot water to flow or not depending on the rom temp, roomstats shut that flow of water off based on the temp of one room,at that point the TRVs stop being able to heat their areas, this is not a problem if all rooms in the house heat/cool at the same rate, or if the stat is in a large area that heats slower than average and cools quicker than the average, however go into most new homes and you will find the roomstat on 20-22C and most of the TRV's on max!
the honeywell comfort zone costs an arm and a leg and the company who sell it on behalf of honeywell insist on commisioning it a a cost of £400 +

thanks for replies everyone

@D_Hailsham
i didnt know what a boiler interlock was exactly i assumed the cylinder thermostat was one so googled is a cylinder stat an interlock and got some interesting articles

this was most promising

http://constructireland.ie/Articles...ls-in-achieving-energy-efficiency/Page-4.html

http://www.comeraghcontrols.com/ind...ticle&id=27:delux&catid=8:radmaster&Itemid=36

will ring the comeragh guys later and see if price is prohibitive