[OpenTRV-dev] Boiler control

Fri Apr 19 15:24:56 BST 2013

On Mon, 15 Apr, 2013 at 8:41 PM, Philip Canavan 
> OpenTherm isn't open as you or I would know it, but it is the new 
> 'industry standard' and is cross-vendor, so it's the most likely 
> target for OpenTRV and many other things. It's also worth seeing 
> whether any custom interfaces\software the vendor provides is in Java 
> - there's no chance they'll claim anything but Windows support (on a 
> domestic system) so Java is the best option you'll have. I went for a 
> Remaha (aka Broag) Avanta which ticked all the boxes, is suitably 
> efficient and supports "advanced" options like a weather compensation 
> add-on. I've been very happy with it, but Other Heating Systems Are 
> Available.

Thanks, very useful advice! It'd be even better if Gmail hadn't sent it 
to the spam folder which it now does with every other OpenTRV email.

>     What's probably just as relevant as which boiler you get is 
> how you're connecting it. I've got a discrete system with dual zone 
> valves for independent HW cylinder and heating control, with a 
> pressurised cylinder; others like an on-demand combi system;

I'll probably go with a pressurised cylinder as per discussions I've 
had with them so far.

> and Damon (and the theorist in me) would argue for a heat store and 
> an exchanger.

Damon? Argue? Surely not!?

> You could go for a diverter valve that gives you on\off and either HW 
> or CH, but I've never understood why. It's worth asking your fitter 
> what they're going to give you (unless you're doing a straight 
> drop-in swap).

That's the point: I have the opportunity to ask for things so I intend 
to make use of that ability!


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