New Vaillant 837 or 937?

[EddyP]

I'm proposing to replace my existing Worcester 240 with a Vaillant.
The house is a 3 bed end terrace, with bathroom and ensuite.
I've done some heat loss calcs which show there's approx 8Kw heat loss total from the house.

Id like a really good flow rate for the shower and bath, which is why i've been considering the 937 over the 837.
I'd like to stick with a Vaillant as they seem good value for money, and I like the idea of their weather compensating VC430.

So do you guys think the 937 is worth the extra space it takes up, and extra expense?

Thanks

 

[gas4you]

Not in your case I don't.

I think the 837 will cope well enough.

Never found a customer yet who really needs the extra flow from the 937.

 

[EddyP]

Thanks for that Dave.

I've read a lot of your posts and you seem to be a bit of a Vaillant expert, so maybe you can help me with this one.
As part of the boiler refit and extension i'm building i'm planning on zoning the house, certainly to upstairs/downstairs, but maybe upstairs/downstairs/conservatory.
I've had a good read of all the VC430 documentation and then mention it can be done into two zones using the mixing system (VR61 i think) however I cant find any details on this, do you know anything about it, or if theres another way to zone the house?

Thanks

 

[gas4you]

I've never fitted a VR430 as yet, but unless it has been re-designed significantly, there is at present no Vaillant controls (including the VR65)that allow more than one heating zone.

You will have to use independent makes for this type of control and use a modified 'S' plan.