For the not so long story, please skip to the next paragraph. So, I’m an avid do it yourselfer who is also cursed with the inability to make impulse decisions. I must have the best and most practical (which is sometimes contradictory) solution to whatever project I’m working on. I’m sure many on the forum can relate, since that is why we are here. One of my current projects is to replace my 30+ year old forced hot air oil furnace and hot water heater. With the opinions and data I have gathered, I’m getting ready (still on the dam fence) to install a Burnham MPO-IQ boiler, Weil-McLain Gold Plus indirect water heater, and Slant Fin baseboard heat emitters. During my exhaustive, mind numbing until I’m blue in the face research, I read about how hot water buffer tanks can help provide longer boiler run times when using low mass heat distributors such as baseboard or hydroair, thereby increasing efficiency of the boiler. It would not seem particle to my situation to purchase a buffer tank simply for my heat setup. Then it dawned on me, I will already have one, the indirect water heater. I thought of this idea of using the indirect hot water heater as a hydronic heating buffer. My plumbing layout is very simple and only meant to convey the idea. Basically, the water from the heating system circulates through the indirect before returning to the boiler. The heat exchanger inside the indirect will act in reverse, pulling heat from the domestic HW. My choice of tank in tank indirect should not add much series resistance to the heating system flow. This setup is simply a plumbing layout change, it requires no additional parts. The only downfall I can see is that I can’t figure out how the domestic HW can have priority if the heating system return water temp stays low for too long. Outdoor reset may also be an issue. Please tell me what you think. Am I missing something? [IMG]http://www.fourseasonspas.com/Water%20Heater%20Buffer1.jpg[/IMG]

Hey guys...Haven't been by in quite a while.Hoping you guys were still around.Anyway about a year ago I posted about replacing my old oil-fired boiler and HWH.I'm sure my old tread is gone by now,I sent pics of my system and the whole deal.You guys were a huge help and recommended the Burnham MPO because if you remember I was looking for a three pass. Well I never was able to do the installation.Things came up as they always do and we needed a new washer and dryer.Aaaaa so I stroked my heating system for another winter.Ok now I'm on track again and I'm getting a system installed on the 4th of July.Need to know what you guys think. For the boiler I'm going with the Biasi B10 and Beckett Burner,with a Buderus S120 (32gal) indirect,three Taco circ's with the built-in flow valves.Extra zone for the master bedroom,Techmar combination low water cut-off and set-back control.Along with a Taco relay pack with choice of function cards that plug in.Post/Purge,Priority Protection,and Pump Exercise.All piping done in copper and black,all ball valves and all the rest of the materials needed to complete the job and removal of the old equipment for a total of $6,300.00. Last time around which was right after I posted with you guys.It was last November the best deal I got was the Burnham MPO and indirect which was setup basically as the above setup and it was gonna cost me about $8,500.So I'm glad I waited awhile.Only thing is the indirect I'm not to sure how good that Buderus S120 is.Can't seem to find any reviews on it,but I know they make a great boiler,still don't mean their indirects are any good. Ok boyz gimmi the poop...Whatcha think!