I have an Intermatic Multiwave installed on one of my pools. The MultiWave device is a great thing, but it is almost useless with Vera. Vera doesn't support it and doesn't understand it. I can control my heater with MultiWave through Vera, but not my variable speed smart pump. The MultiWave is a brick as far as Vera is concerned when it comes to smart pump control.
On my other pool, I have control of the pool heater with a fairly simple set-up. I have a standard 110 volt outdoor z-wave on-off module plugged into a regular outlet. It powers a relay, which turns on and off the 220 v power to the pool heater.
Intermatic used to sell a direct 220 V z-wave switching device, but it is no longer currently manufactured and sold. They can still be found online for sale occasionally. If your pool heater does not draw more amps than it can supply, it would be a good choice as well. I have one of these controlling my hot water heater and it works well.
Note that these two approaches only give you on and off control of the pool heater, they do not give control of the temperature. The MultiWave does give control of the temperature setting, but by taking it over from the heater, not by communicating with the heater. When using MultiWave with a heater, MultiWave uses its own setting and its own temperature probe to decide when to turn the heater on and off, and the heater must be put in 'dumb' mode (ignoring its own temperature probe and settings) to follow the instructions received from the MultiWave.
Hopefully that is clear as mud!
To summarize: 3 choices; MultiWave, Std 110 V z-wave outdoor appliance module connected to relay (best done by electrician), 220 v z-wave appliance module from intermatic (no longer available).
