Original plan of having propane w/h (tank) in house addition bit the dust with venting problems. One alternative is an exterior, propane whole house on-demand unit. Pretty expensive and feel it's overkill for my needs - the normal bathing & laundry are in a completely separate part of the house. Only plumbing shared by sections of the house is that they're both supplied by a single well/pressure tank. Even the septics are separate.
So now looking at an alternative of individual electric point-of-use for 3 areas. Seeing a lot of love/hate opinions. Problems that stand out to me are minimum flow to activate, maximum flow, maximum temp (avoid scalding), temp control, pressure variation vs temp (have well & pressure can vary 10-15 lb), and "cold water sandwich". Have enough electric to handle loads. Currently wiring in prep for drywall.
1/2 bath (primary toilet for "living" section of house): Cannot use a mini-tank here because it would be very difficult to route TPR line. That leaves tankless. Doesn't look like the 110v versions perform well, so focusing on 220v. Most units sized for this usage seem to limit flow .5 to 1 gpm. Anyone use .5 for sink? Do you use 2 handle faucet or single to control temp? Does flow of water "feel" adequate? Do you have max temp limitation? Since temp highly dependant on rate of flow, in practice, does it "feel" normal to a visitor used to adjusting water temp by mixing cold & hot from a tank?
3/4 bath (primarily for pool rinsing) + 1/2 bath (light usage): Looks like a min of 2 gpm needed here. Think tankless would be ok.
kitchen/dining/outdoor kitchen: Looks like a min of 2 gpm here too. Kitchen has sink & d/w; dining also has sink & d/w; outdoor kitchen sink used occassionally. May have to worry about bacteria in pipe to outdoor sink because of not being used regularly - particularly in winter. Seldom get freezes here that last more than a few hours. Wonder if tankless alone will work or if need to add some sort of mini-tank/recirculation. Single or double handle faucets for sink temp control?
Know would have to descale each unit 1 or 2 times each year. Plus have to deal with calcium. Our well water tastes very good, so don't want to filter cold.