Discuss Priority domestic hot water PDHW in the Central Heating Forum area at PlumbersForums.net
Thanks Shaun, will give Vaillant a buzz. I know their Exclusive Green IQ system boiler is 4 pipe. I didn’t appreciate that PDHW delivers higher flow temp to cylinder compared to heating, so makes sense that it will only work using a 4 pipe system boiler. Just need to convince the customer to fork out a bit more for PDHW rather than keeping the existing S plan arrangement and standard system boiler.Have you looked at the Viessmann’s 4 pipe system?
if you must go with vaillant you will require there controls best speak with your local rep they should have a drawing and will help you to set it up
Hello LeeThanks Shaun, will give Vaillant a buzz. I know their Exclusive Green IQ system boiler is 4 pipe. I didn’t appreciate that PDHW delivers higher flow temp to cylinder compared to heating, so makes sense that it will only work using a 4 pipe system boiler. Just need to convince the customer to fork out a bit more for PDHW rather than keeping the existing S plan arrangement and standard system boiler.
Thanks for the replies all.
Lee.
I assume the boiler needs an input to tell it which is calling.On the ideal logic and vogue you can have weather comp on the heating and full temp if hot water is calling for heat.
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