flopped set - but does he have hearts

Firstly, raise to $3 PF. The way it stands, call. Your getting nearly 2:1 which I believe is about right to draw at a full house or quads. The difference is made up for by the fact that your set might be good on the flop.

BTW, can someone tell what the exact odds are of drawing to a full house or quads on the turn or river with a concealed set?

re-raise bigger preflop.

I usually pot the flop here, with a reraise-push, this is an easy call.

You will catch your boat or better about 1 in 3 times (1:2).

If he is drawing for the heart, you're pretty far ahead.
If he already has the flush, you've still got a fighting chance.

[trumpman84]

I'd be more worried about seeing KK here than a flopped flush....in any case, I'm going all in.