If the service is not carried out by baxi customer support, our service division, you must give us proof of service if we ask if you do not meet conditions 2 to 4, this warranty will be limited to 12 months from the date of installation, as recorded on the benchmark commissioning checklist. Looking for a cleaner way to clean drains? check out the. Chemical drain cleaners can be in solid or liquid form that are readily available through. Kevin scott plumbing is not an hvac.