Solar panel thermometers wanted

[Commodore White]

I'm building a house with solar panels (rather than PV) and want to monitor the temperature of the fluid entering and leaving the panels together with the temperature of water in the hot water tank. I've decided to standardise on products compatible with the rfxcom USB receiver and software likely to be either domoticz or domotiga.
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I've ordered a tfa 303125 to record outside temperature, I'd welcome suggestions for the other sensors.

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OK, that was no help! Having read up on some other solutions, it seems like a 1-wire solution might be the way to go. Sheepwalk Electronics seem to have a range of sensors and interfaces for the raspberry pi and there is support in the domoticz software. Looks like I'm on a roll.