c865561a   
   From: Impedance@UgotOCD.invalid   
      
   Tankless water heaters do have some quirks that are easily worked with or   
   worked around. The only real problem I have experienced or know of from   
   people that don't talk nonsense is the minimum BTU output capabilities of   
   the gas burners attemting to use very low water trickles from the faucettes   
   or into home hydronic systems at the low usage end.   
      
      
   Most of the gas units  are 180,000/h - 235,000 BTU/h There are no two water   
   heaters in series needed.   
      
   It's pretty easy to calculate in Imperial measure.   
      
   1 BTU to raise 1 pound of water 1 degree F.   
      
   185,000BTU/h  heating  water 64 deg. F (30F input to 104F shower) = 2890 gal   
   per hour   
      
   or 2890 / 60 = 48 gpm.   
      
   You should be able to take about 48/3.0 gpm = 16 showers, at one time.   
      
   Now those are Input ratings on the BTU and the actual efficiency is about   
   83% on the (noncondensing) cheaper units.   
      
   Your gallon may vary depending on geographic location and your ice may not   
   go through the heater when frozen (ooops)   
      
   ----------------   
   "bob haller"  wrote in message   
   news:1e7b7ca4-df60-494f-8e21-1919c3263e5b@q13g2000vbd.googlegroups.com...   
   OP may need 2 heaters in series to getn the cold winter water hot   
   enough for a good shower.   
      
   theres lots of tankless discussions here mostly talking about their   
   problems   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)