So in searching, it seems like lots of people here like the Taco EBV as a zone valve. Well it turns out they are discontinuing these, and instead they are going to get replaced with the "Zone Sentry" valve. http://taco-hvac.com/en/products/Zone Sentry<sup>®</sup> Zone Valve/products.html?current_category=396 I dont know much about them (my existing system is zoned with circs), but is there any major difference between the zone sentry and the EBV? It looks like they are very similar to me. Im thinking about using one for my setup when the oil backup is firing, but I see they only come in sizes up to 1". I would guess thats OK, since the rest of the piping would be 1 1/4", so its a small restriction. The only thing that makes me a little nervous is that the literature states that its the equivalent of 47.4 feet of pipe, but Im pretty sure Im thinking about that the wrong way. But any thoughts on these valves?