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What looks wrong with current boiler installed
I moved into a new home. There are 2 levels, the finished basement and the floor above. I looked at the boiler. The boiler is a Weil Mclain P-WTGO-4 series 1. Please tell me what looks piped wrong or should be changed. Let me know if i'm correct or incorrect in what I see.
I noticed there is no damper. Also, the expansion tank is connected to the supply line after the circulator. Shouldn't it be connected to the return line? Should there be an air eliminator added and would that go in the return line as well? There is no check valve before the pressure reducing valve. The copper pipe that runs past the expansion tank runs down the back wall and blocks a little black door on the wall from opening. I believe this black door is the clean out for the chimney. There is no isolation and drain valve on the supply line. In the manual, it shows zone valves go on the supply line. Does it matter the zone valves are located on the return line?
On the tankless heater piping side, I noticed there is no flow regulating valve and no automatic mixing valve. Are those necessary? Please let me know if I missed something, if i'm wrong or what else should be changed.