I installed my GW in 3/07 and the first year was hell because I believed all the misinformation from the company and wasted some serious coin. Lucky I found my way here. First off, I have never taken my GW apart and cleaned the back hex ever (but I did have an overheat a couple years back that cleaned her up nice) I have no mixing valve or plate exchanger. No gaskets, but I did seal leaks. I have a seldom used draft inducer and 16' of chimney, no cap. The primary loop is 350'. The water temp in almost never at 180 in the morn, more likely 125Âº, but aways has enough coals to refire. The large house is 72ÂºI have no storage. But I do in a sense, and I believe this is the key to GW's and most wood burning boilers, old fashion cast iron radiators. I started replacing baseboard with cast iron in 2008 and what a difference. Now I have 18 of various sizes and couldn't be happier. My storage is in cast iron plus the water inside. They heat until the water is below a 100Âº and it seem the more the better. Only problem is price. In 2008 I was getting beautiful ornate 10 fin rads for 25 bucks, now the price is closer to 250 and they are harder to find. Plain ones are costing more also. There was a thread here a while back and someone was debated buying some rads cheap, well I would have bought em all if I lived nearby. As far as I am concerned cast iron rads are must have equipment.