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  1. Plumbing
    I'm at wits end and need some guidance on this one... Just replaced a 20 year old Aquastar propane tankless 180,000 btu/hr on demand water heater with a Rinnai RUC90i 180,000 btu/hr one. Old heater used indoor combustion air and had pilot, not much in the way of electronics, had...
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