Honeywell Evohome with 2 zone heating

[EvilDrPorkChop]

No matter what system you use - you're going to struggle having some rads with eTRVs and not (In different zones). Whenever there is a demand on a TRV on a rad, any rads within that zone that don't have eTRVs on will heat. The zone valves don't make the slightest bit of difference tbh.

You'd need to do one zone fully with eTRVs or not. Drayton won't be any different.

 

[samwardill]

No matter what system you use - you're going to struggle having some rads with eTRVs and not (In different zones). Whenever there is a demand on a TRV on a rad, any rads within that zone that don't have eTRVs on will heat. The zone valves don't make the slightest bit of difference tbh.

You'd need to do one zone fully with eTRVs or not. Drayton won't be any different.

I plan to have eTRVs in one zone but I still think that zone should use the 2 port valve. I think this is how the Wiser works

 

[EvilDrPorkChop]

I plan to have eTRVs in one zone but I still think that zone should use the 2 port valve. I think this is how the Wiser works

Why, as they’d all have eTRVs? You don’t need the zone valve.

 

[samwardill]

Why, as they’d all have eTRVs? You don’t need the zone valve.

The trvs are battery powered and communicate with radio. Doesn’t seem sensible to rely on these over a hard wired mains powered 2 port valve

 

[EvilDrPorkChop]

The trvs are battery powered and communicate with radio. Doesn’t seem sensible to rely on these over a hard wired mains powered 2 port valve

The eTRVs would have to open before the zone valve would trigger anyway? The zone valve is only triggering the boiler - if anything it's an extra thing to go wrong. Why are you bothering if you're that concerned - just leave it as two zones with a smart controller and not bother with the eTRVs