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Servicing of Rinnai continous gas water heater

I am just requring a quote at this stage for servicing our Rinnai continous gas water heater. It is an older model (probably installed when the house was built in 2002). There are no other panels inside the house, just the main unit outside. It is connected to the mains gas supply. Would prefer someone who can complete the work on a weekend if possible. Thanks Geeti