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oil boiler locked out on safety extremely dirty yrs. since last service, leaking water from faceplate only when boiler goes cold.replacing a 5gpm coil in an oil fired water boiler with an electric waterheater by its side. i noticed alot of shutoffs above water heater (2) on cold into w/h mounted parallel to each other then T s or splits and cold flow going to d/ coil, also between w/h & riser of boiler (2 )ball valves with fast fill in center, ends up eventually tying into heating pipes with expansion tank #30 nearby. tankless appeared to be shut down for a while. ball valve only prevent from boiler water going domestic, also combintaion of 1/2 and 3/4 copper.is this possibly reason for busted coil? whole layout seems a little hinky and not just for the backflow issues. boiler shuts down for summer by the way. with this information given what would be the most beneficial piping layout, easy answer is replace tie together, and open ball valve to domestic however i think a better layout would be permanent solution any thoughts welcomed and appreciated