True, but I think if a foot valve fails on a deep well, like mine, it might also pull a vacuum. Putting a vacuum breaker on the dhw side of the buffer tank should also protect the well tank, and it's not a big deal to put in. On the other hand, it won't protect the electric or indirect tanks I have since the tanks I'm not using are valved off. So, maybe if I'm going to do it, a good place to put it in would be nearer the well tank so that all tanks downstream would be protected. If it's even an issue, that is. ![Smile :) :)](/talk/styles/default/xenforo/smileys/grin.gif)
![Smile :) :)](/talk/styles/default/xenforo/smileys/grin.gif)