I see you are in Spain, is your electricity supply single phase or three-phase?
And the photovoltaic inverter - is that three-phase? (Of course, if your house is single phase, that must be single phase too.)
You only have a temperature sensor - or more than one - if you want to measure and record temperature.
Yes - you view the data on a normal web browser.
That is possible, but it is not our standard configuration.
Check what your electricity meter does. You can only rely on a meter to flash the LED when importing energy. Many give no indication when exporting. Some do pulse the LED when exporting, but then you cannot tell the difference between importing pulses and exporting pulses.
Normally, we recommend the optical pulse sensor only when you do not have the ability to generate electricity, but it can be useful to calibrate your current transformers.
I think you can do the monitoring with an emonPi (with 5 V DC power pack and cable, a.c. adapter and 2 c.t’s) - the Solar PV Bundle, and I think you can divert the surplus energy either with an emonTx to which you add a power switch (a triac), or you can buy Robin Emley’s Mk2 PV Router in kit form to build yourself. You can of course also buy a ready-made diverter, but you then must rely on the manufacturer for support. I recommend Robin Emley’s Mk2 PV Router - he developed it here and we know it well, and there are many units working successfully in many countries.
I do not see a need for a second emonTx, unless it is not possible to run or extend one or both of the c.t. cables. If your PV inverter connects near to your main (grid connection) meter, then there should be no problem. You put the emonPi near the meter and have an Ethernet cable to your LAN (the emonPi comes with Wi-Fi, you can use either Wi-Fi or Ethernet).
It should be possible - @calypso_rae will confirm that. A small change to the software might be necessary. [Robin: Boiler = immersion heater]
It might be worth emailing The Shop to confirm, but I think unfortunately, and sadly, the emonGLCD kit of parts is no longer available. The recommended solution is to use a discarded smartphone or tablet to display the data.
But if you have the skills, the information to manufacture and assemble an emonGLCD is available in “Resources”.