I’m currently monitoring the flow rate on the ASHP circuit via my Sontex heat meter. There’s also a Sika flow meter connected to the Mitsubishi Ecodan FTC6 controller which I could also probably read but it’s on the same circuit as the Sontex.
What I’d like to do is add one or two flow meters to the CH heating zones.
I’ve had a look out there and lots of expensive kit.
Ideally I’m looking at something more affordable which would be on 22mm pipe, and pulse or proportional analog voltage would work.
I am using a couple of VV100s from Vata Verks to measure flow at my water meter and my natural gas meter. I like these as they are non-invasive (you don’t have to mess with plumbing). Downside is they only work at the meter not at a specific device (such as a water heater).
I used this sensor with an Arduino (which requires a 5v power supply). With a dsiplay and a case, it would be about US$25. I transmit to my home automation system which requires a couple of radios (~US$1) and an another Arduino, and, of course, a home automation system (which is basically a retired computer)
I’ll be glad to help if you want to go this route.
Seriously, @borpin, how is presenting alternate flow meters (and how to use them, with an offer to help) not germane to the question. “Any suggestions for flow meters?” ? My suggestion is in response to your addendum “reasonably priced”
I appreciate wanting to keep the topic on point, though.