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80gal indirect for family of 6 - overkill?
We are adding onto our 1bd/1ba cabin to make a home for our family of 6. Kids aged 5/8/11/12.
Currently believe it or not, we are getting by with a 40gal LP water heater running the basement slab hydronic as well as domestic hot water. This installation is original to the cabin and before my time.
I want the new system to be solar/geothermal friendly (we have plenty of space for a horizontal ground loop). The plan is for a mod con boiler (Lochinvar) to run the existing slab, as well as an addition (tuck under garage) slab and DiaNorm low-temp radiators in 4 bedrooms.
The new structure will have 2.5 bathrooms - the master with separate shower and 6' soaking tub, a powder room for guests, and a full kids' bathroom with tub/shower combo. With 4 kids I can easily imagine having a dishwasher, washing machine, shower, and tub all happening either at once or not far apart. For this reason, I have ruled out the 4.8gpm Lochinvar Noble combi. Would you agree?
Would an 80gal indirect tank be a better fit? Or would a 50gal heated to 140F mixed on output potentially work fine? My wife won't be running the tub every day of course, but I do want to make sure we have the capacity for her when she wants it. What do you think?