vaillant on a one pipe

[billybob150811]

can it be done is it okey its a domestic property had a pott prima b/f a cylinder on gravity and a pump on 15mm doing what appears to be a one pipe its bottom entry opposite end for the rads and my mate is fitting an 831 I just want to know if it will work okey

 

[gassafe]

Fitted Worcesters on this type a few times & had no probs

 

[ShaunCorbs]

you could have problems but let us know how it goes

 

[kozak1968]

Contact vaillant technical is your best bet. You don't want to cause yourself problems.

 

[gassafe]

Contact vaillant technical is your best bet. You don't want to cause yourself problems.

They'll just say no, read from the big book of rules! Like phoning salamander...

 

[newcastle phill]

That will not work ok i think youll struggle to get 24kw of heating round 15mm system anyway.. You will not realise any efficiency savings from the new boiler and it doesnt meet building regs standards.

 

[jonnyswamp]

I've done a few a round here and they've all worked
More efficient than what was there before (bbu etc) but not as good as they should be

 

[thereisawizza]

Can a one pipe be cleansed according to BS:7593 tho?

 

[Scott_D]

Vaillant and worcester say their boilers will work on a one pipe system but the efficiency will be reduced.
I have an email from them from a few years back

 

[billybob150811]

yeah it works,not great but the rads and the valves are out of the ark

 

[macackau]

Yes it works, fitted an 828 to a one pipe, it was 22mm though with 15 tees up to rads. Worked fine.

 

[Leo21]

It works, as long as you connect it exactly in the right place. Don't try moving the boiler!

 

[EPH]

Fit a small low loss header or connect it with closely spaced tees. You'll still get the correct flow rates either side then.

 

[Leo21]

Fit a small low loss header or connect it with closely spaced tees. You'll still get the correct flow rates either side then.

That's an awfull long way round a short problem.

 

[EPH]

How else can you connect a boiler with differing flow rates?

It's not a long way round, it's very easy.

 

[Leo21]

Post 14, done it a few times now.