So right now I have a gauge on the drain outlet of one of my water heaters to give me pressure. It's pretty accurate. I was wondering if I could rig up a sensor instead I don't know if there is anything commercially available that would allow me to do this that's compatible with hubitat. Any ideas?
You can get pressure sensors on ebay for not too much money. They are not super stable but if all you want to know is the general pressure they should be fine. You would need a device to read the voltage coming from the sensor. You could use the Fibaro implant or similar to "read the sensor"
Curious, is there something specific you are watching for? Perhaps a pressure switch would be easier to interface if it will do what you require.
I use a LoRa battery powered device + pressure sensor for similar pressure readings on my pool pump. Accurate enough for what I need (supposedly 0.5% full scale on a 0-80 psig sensor) - like $18 on amazon.
Instead of LoRa though you could do a battery powered arduino (or mains powered if applicable) and bring it into hubitat with hubduino. That takes a bit of programming work though.
I don't know of anything battery powered that is 'off the shelf' commercially available that can integrate into a home automation system though.
Not a bad idea. Probably easier than hubduino/arduino if one isn't versed in those.
Not really, simply to have a tile with current water pressure. I figure I could put it on the other water heater (I run 2 75 gals in tandem)
Yeah I don't really know the programming side. 
2 years later, is there any change on that topic? Did anyone made such a thing as a reasonable priced zigbee or zwave water pressure sensor or is the fibaro DIY is still the ugly but simple solution?
I would like to turn off the water heater and close the shutoff valve if water pressure drop to 0.
Edit: ... I guess not. (Sorry I found a more recent topic)
Since you run HA, this might be useful:
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