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Thankully, these newer units come with the Hot Button PCB pre-installed, so you don't have to buy any new hardware for the water heater. I purchased a simple Zigbee Dry Relay and wired it up to the Navien's hot button PCB.

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When motion is sensed in the kitchen and if the recirc pump hasn't ran in the last 30 minutes (during certain times of day).

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Now that this is all working, the recirc pump is running at a 90% decrease in terms of overall run time and we don't notice any change in comfort!

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... backflow preventer need to be placed in an enclosure (hot box)?. A: Yes, all exterior backflow devices are required to be in a protective, above-ground box.

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So our new hot water heater (Navien NPE-240A2) has a dedicated recirc line and pump to make sure you have hot water instantly on the other side of the house, but the built-in logic is incredibly inefficient, which runs every 30 minutes 24/7, wasting a ton of gas/energy in the process, and emitting GHGs. There is an "intelligent" mode that attempts to learn your schedule, but it was wildly off in our first couple weeks of use.

One way Navien tries to make this more efficient is by having folks install a "Hot Button", which is a physically wired button in the rooms where you want to start the recirc pump manually. While this would add a lot more efficiency, pressing buttons != automation, but at least I thought I could use a relay to simulate this button press within Home Assistant logic!

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A hot water tempering valve is anti-scald device and it's designed to mix cold and hot water. To keep us safe from hazards such as Legionella, ...

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After getting that working, had some fun playing around with some events/automations that would ensure it ran the least amount of time while ensuring instant hot water when we need it most.

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Immediately after we come home from being away for awhile, since we're likely to need instant hot water for various reasons.

Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io.