(02-22-2016 10:22 PM)AlanE Wrote: You should size it for the total GPM / temp rise it would be called to produce if all fixtures were in use. Is that overkill? maybe and as you said it may never happen but it *could* happen.
Right. I'm thinking that if that turns out to be the case, I'll add a third tankless unit, as I can easily split the kitchen from the bathroom. I could even add a fourth for the laundry room, but I think THAT would be overkill.
The water coming in to the house is not very cold as I live in a very moderate climate. In the summer time it's possible to grab a quick shower and never turn on the hot water, as it gets heated just running through the pipes in the attic. But that is a really quick shower for a very over-heated person who's been outside sweating. The last thing you want in that situation is a hot shower.
Quote:If cost is an issue, demand heater, gas line upgrade (which you may have to do figuring both systems running at the same time) it might be worth it to just stick with a tank system.
That's what I said 8 years ago when I replaced the last tank. Hopefully the gas line is adequate. It's a 1" line coming into the house, but then quickly reduces to 3/4" at the first branch. The heaters I'm installing have 1/2" inlets. I'll run a 3/4" inch line to the next one, just in case I ever have to upgrade to a larger heater.
Quote:You could use a timer to keep it off at night. I have a timer on mine but previous home owner removed the pins. I'm sure I could order them since the timer is a common intermatic but just haven't gotten one of these yet:
I do have a timer and it's set to come on only at times when we're home. I had to install a relay because once the pump got a few years old it started burning out the digital timers I was using. It has an on-board analog timer but it can't be programmed differently for different days.