New build house. Cannot heat above 18.5 degrees

Swipe

Why would anyone need a hall warmer than 18.5C?

Lorian

Presumably there is no TRV on the hall radiator as they haven't fitted a bypass. You might want to check the system is balanced on the lock shield valves (but in particular checking the lock shield valve on the hall is opened enough)
But as someone posted above - if its dual zone and you are not heating upstairs at certain times of day any heated air in the hall will just head up the stairs rapidly. Closing all the upstairs doors during the day might help a little. make sure the loft hatch is sealed and is insulated too.

bris

Heat rises, you are heating the top of the stairs. 

Take the thermostat out the hall and put it where you spend most of your time, you don't live in the hall, you pass through it to get to other rooms.

The livingroom is where you want the stat, a wirless one you can take with you to where you are is even better.

Never understood why people keep there stat in the hall.

rickyroma

We moved into a new  build in Nov. Had the same problem... Generally OK but the living room and main bedroom not warm enough. Took the thermostatic valve off the living room radiator and its all OK. The rest of the house ticks over fine, the living room is warm now which rises up to the main bedroom above it 

bouicca21

I was going to say the same as Swipe.  I’ve hardly had the heating on yet but when I do it’s set to 18.   Wearing a jumper/cardigan is way cheaper and more comfortable than turning the heating up.

[Deleted User]

Every rad should have about 11C difference between the inlet and the outlet at full whack. If they don't then the system needs to be properly balanced.

markin

[Deleted User] said:

Upstairs/downstairs zones... Someone doesn't understand that heat rises.

Has building regs changed to insulated between floors.. otherwise it seems a bit pointless and can be better done by TRVs or smart trvs

billy2shots

ComicGeek said:

ps2mint said:

Thanks for all of the replies. Yes, living room and downstairs are all ok. We have two big radiators in there.

The situation is a bit more difficult as we have two heating zones. We don’t currently heat upstairs during the day. We keep all doors closed upstairs though but some heat may be drifting upstairs.

Also don’t really understand how to set two zones efficiently in the house as never had this set up in previous houses.

You can't turn off heating upstairs and then expect the heat to stay downstairs! The hallway heat is just vanishing upstairs, which is why the ground floor zone isn't switching off. 

Set the upstairs heating zone to say 18 when you are heating the downstairs, and then see what the hall temp is.

OP

Your answer is here. 

You have 2zone heating but it sounds like you are just turning on the downstairs heating not the upstairs 

I know it sounds less economic but put the upstairs heating on as well.  This will stop all your downstairs heat moving upstairs away from where you want it. 

It turns out more economical because your heating will get up to temp and the boiler will turn off.

This 2zone system works one way really. You can heat up the upstairs independently but it doesn't really work the other way around.