We have come across an installation that has been certified. It is a Rinnai Infinity 24 running off an autochange regulator mounted down low running off 2x 9kg LPG bottles. I don't believe that this is compliant because the 9kg bottles can't supply enough LPG without freezing up. What are your thoughts??

Linkback: https://www.plumbers.nz/instantaneous-water-heaters/67/infinity-off-9kg-lpg/1965/

hi guys, cant see why it would not be o.k. This is done so customer does not have to pay the $90.00 per yr. bottle hire charge. Don't know how much the `electric blankets` cost but will need power point installed, think i would pay the hire charges and stick to the 45kg bottles. The other way is for the customer to purchase 18kg bottles,cheers

hi guys,   (9kg bottle won't supply enough gas without freezing up)I`ve seen infinities run off 0f 9kg wouldn't do it myself but hey!! locate them in the sun they will work better. (Qcc connections are not meant to be connected with the POL hose fittings either) so why do they have internal threads, cheers

I am pretty sure the LPG association of NZ, in there code of practice vaporization rates are given for differing sized  bottles at different temps. If your appliance requires a certain amount of vaporized gas then the bottles being undersized would make the installation non-compliant in my opinion.

Under sizing LPG bottles would be like under sizing natural gas piping (just to save money), which causes potential incomplete combustion and an appliance that has a lower efficiency that what it is rated if it is not receiving enough gas at all times. It seems that some people don't care though so these types of things will always be out there.

I have never seen this but have seen manifolded gas water heater installations with not enough LPG bottles (also manifolded) causing hot water temp issues as the appliances are starved of gas especially in the colder months.

Wouldn't do it, wouldn't recommend it - just crazy.  I recently read a report from an LPG consultant that said an Infinity installation with a gas hob should have 4 x 45kg bottles running it - and on megajoule ratings they might be correct - but who would recommend this for an Infinity and hob?  It would need a location test certificate and imagine the yearly rentals - LPG sales would plummet if this was a requirement.  So that is one extreme and this is the other.  I would just walk away from a job like this...

hi guys, just recently saw a 24lt infinity that was running on 1 9kg bottle for a sleepout. Owner says that it runs fine but I suspect that it runs fine as is only required for short periods of time. I have frozen the BBQ bottle up by running all six burners.
 Am I mistaken or is it the surface area that is the problem? more surface area would equal more evaporation and more available gas. I notice in Aussie they have much larger bottles/cylinders with about 1mtr diameter which is a lot of surface area also just a small copper pigtail to supply gas. Also I believe they do not use rubber pigtails,cheers