simple single zone controller

looking for opinions on a simple, economical, and reliable single zone pump controller. There is low voltage stat wire ran, I probably would have went with a line voltage stat to the pump if they had run romex. My thought right now is a Taco SR501 to simply activate the pump when the stat calls, I shoud mention this system is fed off a 50 gal gas hot water heater (Iknow, it's a homeowner thing). Any suggestions are appreciated, I have piped a lot of boiers but not wired any syatems (although this is about as basic as it gets)
Thanks, Jeff

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