Yes or usually. All tankless water heaters regardless of brand will have some sort of special requirements for the exhaust venting and intake air. The two biggest issues that we run into on repairs or service calls is that the intake air and exhaust are too close together causing error codes; or the exhaust was just never done correctly when the tankless water heater was installed and now damage to the unit has occurred. What we see far too often is an unknowledgeable installer will improperly tie the new tankless exhaust venting into the existing metal b-vent pipe that was used for the regular tank type water heater(s). This is NOT allowed and will void the warranty. It could also cause permanent damage to the tankless water heater. A correct install that has been permitted and inspected will have the venting completed all the way through the roof or side wall based on model and/or location. With an Earl’s Plumbing tankless water heater installation, we employ a certified third party roofer that comes to your home within 3 weeks of completion and fully completes the exhaust work. This includes removing the old metal b-vent that is temporarily being used as a pass through to allow the unit to operate, new weatherproof pipe boot flashing, final required fittings installed, and all spray paint to match. This used to be optional, but we determined that it never got done so now it is included in our price so as to not void any warranty related issues.