To present a slide show I downloaded the Chrome browser. to show the browser screen on the Chromecast receiver monitor/TV. For the slideshow I added the Chrome browser iSlide extension. I found that I could not use it directly to present a folder of photos on the laptop.
Installation of water heater requires a plumbing permit. I recently had a water heater installed and the contractor got a permit. When the inspector came, he asked why he was there. I replied that I was told a permit was required to replace a water heater, but he said he had never heard of such a thing.
Local Codes. While the NEC does not require a water heater breaker for a home without an electric water heater, local codes may require a breaker to be installed for an electric model, even if not used. The reason for this is simply to ensure a house has a complete electrical system for all possible situations.