If so, could I get a quick ballpark pricing on these options so I can figure out which option is the sane one to pursue?
Have an old bungalow with short fat 135L low pressure hot water cylinder in a cupboard in the bathroom. its a standard low pressure system with an pressure reducing valve and a vent pipe out the roof. I want that vent pipe gone before the new roof goes on, for reasons.
So as is see it I have the following options:
option 1) convert existing cylinder to valve vented with a drain under the house out to the gully? i'm guessing im up for a few valves some pipe and a bunch of labour.
option 2) Mains pressure cylinder located in same position. Already found there are cylinders that should fit in the same spot. So the cylinders appear to be about $1500-1800, and it'll need a drain tray etc, and a different set of valves i guess.
option 3) outdoor mains pressure cylinder. Slight complication in that it wouldn't be directly against the house as we have a deck/walkway thing against the house, then a 800mm wide gap between the walkway and the fence. I could concrete a post or two in so the cylinder can be strapped to it for seismic restraint, and pour a concrete pad for it to sit on. Obviously pipes would need to be extended approx 5m out to where the cylinder is so some more cost there, but it frees me up to choose an all in one heat pump cylinder or conventional resistance heater, and go as big as I like without impacting the linen cupboard space.