Oh, on another note. As I did a WC on the big setup last night, I noticed that the temp of the water has increased dramatically. Hooray for lids!
BTW, a little hint for every one. Try to not get lured into being on MFK while changing water. 4-5 heaters that are uncovered and on stink! LOL. I'm a forgetful SOB. Pump sounded wierd from upstairs (I know, its loud), then I think, Holy crap the water. Ran down stair and started up the drip system on full bore to help fill it back up. Ha Ha. You'd think I would have figured it out the first time I did it. I guess I won't install the new heaters until I put in the overflow drain. Normal water changes for me are just to reduce the amount of water in the sump so that the drip system can keep filling, that is, until I get the drain line put in.