My X-300 came yesterday. I spent a couple of hours and accomplished the following:
1) Got 8 sensors programmed to work with it. That was probably the most tedious part of the install. Six are the temp only sensors, the other a the wall mounted Temp/Humidity sensor which actually has 2 sensors in it, one for temp and the other for humidity.
2) Installed and configured X-300 in basement and connected to my network.
3) Wired 2 pairs of temp sensors to two Cat-5 cables and connected to X-300.
a) One pair is monitoring OWB temp as soon as it enters house and as it leaves house to return to boiler. This is accomplished ahead of the thermostatic control valve.
b) Second pair is monitoring at the 20 plate exchanger. First the boiler water in temp, and second, the heated domestic water into the 50 gallon water heater (storage tank).
4) Connected the wall mounted temp/humidity sensor to tell me of basement conditions.
5) Last two temp sensors will be installed to monitor the temp of the boiler water as it enters the water/air exchanger in my furnace plenum, and the boiler water as it enters the air/water exchanger in the garage.
For what it's worth, my temps are in total agreement (within the accuracy of the sensors anyway) with the OWB controller temp display.
When I installed the basement plumbing I used 1" copper throughout. I attached the temp sensors to the copper pipes using aluminum foil tape. Wrapped tape about 3 times around pipe, and then covered with foam pipe insulation.
So I got the SMTP email notifications working with GMX mail as Ridgekid suggested.
The crappy DSL modem I have from CenturyLink will not forward html requests into my network despite the fact that I configured it to do so, so I am planning on turning off its firewall and NAT router and replacing that portion with a more configurable router. Then I will be able to view the real time temps from outside, ie. on my iPhone.
I'm now looking for a small/inexpensive tablet with WiFi that I can configure not to go to sleep and mount it on the wall next to my Ecobee thermostat so I can see the temps easily. Not sure what it will be, but I really want to keep the acquisition cost at or below $100.