Does the W200 thermostat support a 2 stage heat hump compressor?
Yep, straight from the manual — the W200 explicitly lists heat pumps with 2-stage compressor support, and the wiring diagram has dedicated Y1/Y2 terminals for stage 1 and stage 2 compressor. So wire your existing Y1/Y2 straight over, no adapter or workaround needed. Only thing I’d ask: does your existing thermostat also have separate AUX terminals (like E, W2, or Aux1/Aux2)? Heat pump setups can have those too, and if you’ve got 2-stage aux heat in addition to 2-stage compressor, that’s supported too — just make sure you land those on the right terminals during install so you don’t lose a stage.