Hello all,

My question is -

I have a mains cylinder and I am just about to have a new fire installed with a wetback.
My cylinder does not have a heat exchanger built in and for a while I wont be in a position to have the cylinder swapped.

So I have an idea that may be fruitless but I would like to know one way or the other,

I work with a four plumbers and an engineering dept.

I want to know if I can build a external heat exchanger and fit to my cylinder until I can afford to have my already but brand new cylinder replaced (kicking myself for such short sight)

My current cylinder as 2 x  inlet and outlet fittings, one side 120 deg  from the other is blanked off.

I want to know if there would be any reason for not being able to basically run and mains pressure coil between these two points and then build a low pressure box around this coil for connection to my wetback?

The box would be double skinned with expanding foam insulation between the layers.

My cylinder is under the house and so I would have to have a pump fitted for circulation for the wetback.

If this is possible would I have a problem having it signed off by an inspector?

The plumber I work with said if I can build it and get the local council to ok it he would fit it and do all required for the wetback etc

Your thoughts would be great, plus may save my blushes should this be a bullshit idea and finding out so at my local council.

Thank you all for your time

Glen

Southland 

Linkback: https://www.plumbers.nz/q-and-a-wetbacks/61/mians-cylinder-and-wet-back-fire/1475/

Thank you very much for the reply.

Luckily I live in the SDC area.

The plumbers I work with are all registered so thanks anyway,

They advised me to talk to one of the inspectors at the SDC who worked at my place a few years ago.

Again thank you for your answer

Glen