2 zone controls with combi

Ktm640 · Mar 22, 2016

Hi all,

We have just had an extension built which will have a new 938 Vaillant combi boiler for CH and hot water.

This will replace a Baxi back boiler in the existing part of the house.

We are installing a new central heating system in the older part of downstairs and throughout the upstairs (the downstairs in the new extension will have underfloor heating).

Building regs state there must be two zones and rads must have TRV's.

Can anyone recommend a good package that includes the zone valves and room stats ?

The ones I've seen all seem to include a cylinder stat that we won't need.

The new boiler will be in a purpose built utility room. Would you normally install the tee to the two zones at the end of the copper coming off the boiler and then install the two zone valves immediately after the tee?

Thanks in advance

Gray0689 · Mar 22, 2016

Your plumber will sort all that out for you

Ktm640 · Mar 22, 2016

Gray0689 said:
Your plumber will sort all that out for you

Hadn't thought of that

lame plumber · Mar 23, 2016

I pop to the merchant and ask for 2 of those and 2 of those and 2 of those and it all depends on whether the customer wants to spend more or less as to which make is used, simple really.

macackau · Mar 24, 2016

How many bathrooms in the house for that combi to be supplying? Have you considered a heat only boiler/system boiler and an unvented cylinder ?

kozak1968 · Mar 24, 2016

Done deal I think

macackau said:
How many bathrooms in the house for that combi to be supplying? Have you considered a heat only boiler/system boiler and an unvented cylinder ?

Ktm640 · Mar 25, 2016

macackau said:
How many bathrooms in the house for that combi to be supplying? Have you considered a heat only boiler/system boiler and an unvented cylinder ?

Considered it but went for a large combo with small in built tank instead

Ktm640 · Mar 25, 2016

kozak1968 said:
Done deal I think

What do you mean?

kozak1968 · Mar 25, 2016

Sounds like you've chosen your system. An unvented cylinder would be the preferred option in my opinion. Your local merchant should be able to help you on the controls side if you choose to go with the 937.