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Arcoliner tankless DHW coil sizing?
I am hoping someone might be able to point me in the right direction. The tankless coil on our furnace blew out last night. I do mean literally blew a hole in the plate and had a stream of water shooting out the side of the boiler.
The system is an Arcoliner 0154T 1BT J2 rated @ 99 mbH for water and 1.35 GPH firing rate. The tankless heater has 589 cast into the plate but here's the issue. All of the plumbing houses I talk to want to know the GPM rating of the existing coil and tell me that it should be on the plate as a suffix to the 589. I have wire brushed the plate and there is nothing there.
How do I figure out the size so that I can order the right one? If it helps we have small cape with one full bath with tub, washer, dishwasher and kitchen sink. No other DHW outlets. I know the cold water flow from the well pump is approx 6 GPM but am afraid that a 5 GPM tankless will be too small.
FWIW one of the counter guys I talked to one very helpful but one was down right insulting. Basically said that I shouldn't be touching the system because I was not a licensed contractor and obviously didn't know anything because I was asking about the sizing. I may not be a heating contractor but I do work for Coen as a controls engineer designing burner management systems for industrial and power boilers. I think I have a pretty good grasp on how these things work.