Returned to install new tankless water heater, removed the old tankless and installed the new one. Brought everything but the t&p up to code, discussed with the customer we would have to drill into the side of the home and they want to avoid that. Everything else is up to code and permit is up to the customer to pull if they want to, and they understand that more work will have to be done when they do. Turned the water on with no leaks, turned the gas on and the unit tested perfectly. Customer called the shop and made the payment over the phone.