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Discuss Priority domestic hot water PDHW in the Central Heating Forum area at PlumbersForums.net

Hi everyone,

I have a customer who needs a new system boiler, currently has a 22kw which I've roughly calculated as enough heat output for the heating (its a 6 bed victorian terrace house), but this doesn't take the 200l unvented cylinder demand into account. Currently the system is setup on S plan, with no priority domestic hot water. When I fit the new boiler, I would like to try and set it up with PDHW for obvious reasons, but I'm not sure if this is possible with the existing two x 2 port valves (both normally closed).

I know PDHW is a hot topic at the mo, but I've not delved into it as yet (mostly combis in my area). I've found a wiring diagram for W plan using a three port (2 position) valve, but can't find any wiring diagram for a two x 2 port valve arrangement. I've found a little info on X plan, but again, not much info out there and it looks like it's something to do with Intergas boilers. I will be fitting a Vaillant on this particular job.

If any of you guys can point me in the right direction that would be great.

Thanks, Lee.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer

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