conventional boiler and PRV

[rhinosaw]

I assume that a conventional boiler doesn't have a PRV so if you are going to pressurize the system where do u put the PRV , with the pressure vessel going in the airing cupboard?
Is it a case of putting one in the pipework near the boiler or should it be near the pressure vessel or doesn't it matter? thanks

 

[ianmcd]

You get an external expansion vessel kit, this one has everything, but you can just buy the kit if you already have an expansion vessel, I am not recommending this its just to show you what it looks like.
https://www.jtmplumbing.co.uk/central-heating-controls-valves-c436/zilmet-pressure-vessels-c525/zilmet-robokit-intafil-pressure-vessel-plus-sealed-system-kit-p19386/s21622?utm_source=google&utm_medium=cpc&utm_term=zilmet-robokit-18l-intafil-vessel-plus-sealed-system-kit-ifp18-zilme-zilmet-18l-robokit-vessel-plus-sealed-system-kit-ifp18&utm_campaign=product+listing+ads&gclid=Cj0KCQjwkK_qBRD8ARIsAOteukD1siaRrgKaDsERUj-46uEE_8rWVv5h9mYDpHXtO9y61NdYvQkXmWEaAvHuEALw_wcB
What make and model is the boiler ? you might have to install O/H or low water content protection too

 

[rhinosaw]

Thanks Ian
Boiler would probably be a WB 12ri.
If the pressure vessel was to go in the airing cupboard which is not on an outside wall then I presume that a copper pipe would have to run from the A/C to an outside wall for discharge?
What is O/H. ?
Thanks

 

[ianmcd]

Sorry @rhinosaw O/H is over heat thermostat, but if a Worcester Ri it already has one so no need to worry, the PRV discharge can go outside or into an internal drain if you install a tundish, PE pipe if high temp rated can be used, if running to outside you dont need a tundish, but good practice to fit one anyway, they are not expensive

 

[rhinosaw]

Thanks again, have heard of tundish, just remind me what it does, thought it was to do with vented HW cylinder

 

[ianmcd]

It is simply a way of visibly noticing that water is passing from the Pressure relief valve, yes used on unvented mostly but not exclusively, it is simply a bit of , Plastic usually, can be brass too though as well as other materials, as said only required if you are connecting to a drain, but good practice to fit even if terminating outside.
https://www.ebay.co.uk/itm/15mm-x-2...361645&hash=item3636dfcc4d:g:0~AAAOSwaK1bSc24

 

[rhinosaw]

Thanks, I have another question regards system boilers, will start new thread