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Hey fellow Wallies,
So two years ago I installed a 4 section Buderus G115, hydrolevel aqua stat with a SSU60 tank, piped the side arm with 1" copper and a 007e. The boiler is piped direct no primary secondary, (won't do that again). I have a Caleffi mixing valve and the tank is set for 140, going out to the house at 120, I believe its just a honeywell aqua stat on the tank, standard on/off
All winter this thing is a champ, it heats water for 8 people, and this big 4500 sqft place in stowe vt
Last summer this thing acted up it was running out of hot water in the summer. I went there and they are saying after a 10 min shower, a second person only gets 5 mins then its cold.
I went downstairs and watched it, and they are correct. The boiler fires up cold and sucks all the heat out of the indirect when it first fires. The boiler can not come up fast enough to not let that happen. I turn the LO temp up to 140 and think ok, well that worked for awhile. Now its back, its still at 140 lo temp, 185 hi temp ( for test purposes). What I am finding is the aqua stat location on the G115 is on top, the rest of the boiler is cooling off down around 120 but the top is still over 140. So when there is a call for hot water, same deal happens it cools the tank with the colder boiler water before the boiler can catch up.
I am thinking of wiring the water heater pump through the circ call on a triple stat to not allow the pump to come on until the boiler is hot but I dont think its going to work the way I want it to, due to the heat all sitting at the top of the boiler. Maybe a delay on the DHW pump so the boiler can get up to temp??