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Califont for 82 bed residential shower block

We have gas but no hot water. Probably due to lack of use over last 6 months - have flipped gas bottles and reset gas. We have a school camp and children and adults needing warm showers. I cant hear any noise coming from califonts. There are two large industrial califonts - not sure what brand. They run of 2 x 45 kg LPG. Please help urgently. --- First thing in morning is acceptable. We are in Hunua Regional park.