High Volume Hot Water System Design Help
I'm new to this forum but have been lurking for weeks looking for info on a new hot water system.
We have a full (to studs) remodel in progress on our house and have plans for a large shower in the master. I want to make sure we have the correct water heating setup to ensure we can enjoy the shower we've paid so much for. I'm not looking for info on which setup (i.e. tankless vs standard vs hybrid) is more efficient or will have a faster payback...just what will produce the results we desire. I also want to ensure we don't get the cold water sandwich, or problems with pressure balancing valves, hot water to the high efficiency appliances, etc.
House has 4 total bathrooms. System will feed 2 standard showers, a large soaking tub, the large master shower, high efficiency washer, water miser dishwasher, two kitchen sinks, 4 bathroom lavs. Heater location is in basement.
My main area of concern is the master shower. It is a 2 head shower, each head with 3 body sprays, plus one large rain shower head overhead. I know it sounds wasteful and it will probably only be used 1 out of every 90 days at full capacity, but I'd like to be able to run the shower as it's designed (i.e. all heads running) without worrying about running out of hot water. Otherwise why spend the money??
I'd love any suggestions on system setup from all the experts here. My current plumber (who doesn't seem to have a ton of system design experience) has suggested two State Commercial 130 Gal, 500,000 BTU Water Heaters Water Heaters in parallel at a whopping 12K a piece. 24K in 2 water heaters seems a little overkill for one shower but I'll use you guys as a reality check. I'm open to tankless, tankless with tank, tankless with recirc, standard, hybrid...all of em as long as I get realiability and it works. I can run new lines as necessary. I'm also open to different heaters feeding different loads if necessary.
Master Shower Flow Specs:
1 ea: Shower Head @ 2.5 GPM
3 ea: Body Sprays@ 2.5 GPM ea
1 ea: Shower Head@ 2.5 GPM
3 ea Body Sprays @ 2.5 GPM ea
1 ea Rain shower head @ 4.0 GPM
Thanks in Advance!!!