Hi integrated, I am a plumber. Yes in most cases the drain is longer than 12m, that's what makes it hard. What have I said that is incorrect? In regards to solar, if power fails then the pump is not working hence no hot water will be pumped back to the tank and stagnates in panel plus there has not been an official statement on this matter anywhere that I am aware of.
Please share the rules around "that" very interested.
registered licensed or certifying? - everything you need to know is outlined in g12
Basically if my drain is not made of copper and is a minimum of 25mm the inspection fails! I have looked into the standards and cant seam to find a guideline in this regard.
drain size depends on safety valve sizing - material is mandated copper in g12
I know all about the drain sizing and the problem with copper is that it gets really expansive at 25mm. I can run the CWE separate with PVC but the TPR max 12 meters with no bends + it gets expansive.
If you are required to have 25mm drain and you or your employer has not allowed for this then its tough titty basically
Another issue we face is that with an uncontrolled heat source (there is a big debate whether solar is an uncontrolled heat source.
Solar IS an uncontrolled heat source - I say this as a Solar engineer - any REPUTABLE supplier will tell you the same
TPR can never discharge into the drain system and must run to a soaking hole outside. We then face the issue that as per NZBC the TPR drain cant be longer than 12 meters and for every bend it become a meter less. You cant win!
the relief valve drain system in total can be greater than 12m
the tpr does not "have" to discharge to a soak hole
Has anyone had the same issues? How have you been able to streamline this problem to councils satisfaction? How do you guys usually combine the two, any pictures would much appreciated! thanks for your help in advance!
as with all things there is more than one way to skin a cat - some lateral thought may be required, if the house is slab on ground with floor already down with only 20mm drain in place where a 25mm drain is legitimately required (not saying it is - I know too well how councils love to take the piss and exert authority) and you cannot run drain through internal framing then you may well be up the creek