Vaillant VRT 360 - Can This Be Recessed Into Wall

Looking at Vaillant VRT 360

The dimensions are quite large but it is the depth that concerns me - 34 mm.

Does anyone know if this unit can be recessed into a wall or whether it has to be surface mounted? The installation instructions on the website don't state but hint at surface mounting.

Has anyone got one fitted in a lounge? I'm concerned that it will be a bit of an eyesore.

Main reason for fitting one is actually to gain separate temperature control of DHW. As I see it, without the VRT 360 or similar, you can only set a single temperature on Vaillant ecotec boiler. If you want maximum efficiency you need lower flow / return temps but this conflicts with DHW requirement at 60 deg? I have to set my temp on the boiler close to maximum if I want to stop the boiler from short cycling when heating DHW - makes sense to me because if I want DHW @ 60 then boiler has to heat flow to hotter than this, say 70 deg?

Perhaps I am missing something?

I assume you have a 4 series or 6 series ecoTEC?

If so, the VRT360 will not let you adjust the HW temp unless you also have a VR65 wiring centre together with a temperature probe thermistor for the cylinder.

The room thermostat function of the VRT360 will be adversely affected if you bury it in the wall.

Have you considered the radio version, VRT360f?

Hi Simon

Thanks for the reply.

Having done a bit more research, looks like the VRC430 + VR 65 is the way to go? Boiler is ecoTEC 428 by the way.

VRC 430 can be located out of site and then i would have to 'trust' the fact that it can drive the system based on external temperature.

My house is 40 years old and I guess that even with all the additional loft insulation that I've fitted, I'm going to have to set the temp compensation curve to be higher than ideal...does this undermine the whole concept?

I have also been looking at similar questions about non uniSTOR cylinders and NTC type thermocouple use. Some say - yes you can fit it, some say no you can't. I have a Megaflow cylinder and don't see why I can't attach a thermocouple to it...any experience of this?

You can't use the VR65 with a thermocouple and the Megaflo reliably.

The Megaflo hasn't been certified for use with the thermocouple and if so fitted would not meet G3.

The only way you could do it would be to use the internal Megaflo overheat and temp stat wired in series with the two port valve, and the Vaillant thermistor.

This way, if the Megaflo stat was set to 70C and the Vaillant to less than this, in normal circumstances the Vaillant eBus controls would have the upper hand.

In an overheat situation, the two port valve motor supply would be interrupted by the megaflo. But this would not turn off the heat source (boiler) if the thermistor was not sensing so is not the perfect workaround.

We do use VR65 and thermistor on normal open vent cylinders, this is not supported by Vaillant as a solution but of course there are no safety implications.

Hi Simon

Thanks for that, it makes a lot of sense.

In hindsight I don't think that I'll gain too much by using the thermocouple, the reality is that the DHW doesn't cost me too much, the heating is where most of my cash goes.

I think I'll stick with the standard 'cut out' thermostat into the VR65 which will at least allow me to set higher flow temp for DHW verses Heating.

I guess that I'm probably wasting cash by trying to use a VRC430? I can probably make some savings by running the Heating Flow at a lower temp for a few months of the year, cranking it up manually when the odd cold snap occurs.