62146f5d   
   From: Impedance@UgotOCD.invalid   
      
   I would challenge you to take a shower much more than 104 F. A hot tub with   
   105 will prevent you from getting in. SHowers can stand a bit higher due to   
   lots of air mixed on your body. 96 F is a cool shower.   
      
   I run mine about 140 F as that is the recommended temperature by Legionella   
   experts, not as the tankless manufacturers recommend. It also gives me   
   faster  morning recovery from house temp setback during sleeping periods,   
   than a lower temp. Setting a personalized temp at each faucette before usage   
   is a dumb thing to do and will be forgotten when doing dishes or other temp   
   critical job.  Setting a tankless to higher temps. increases the need for   
   maintenance due to hard water deposits in the unit.   
      
   These things have plenty of BTU/h capacity and that point is moot.   
      
   Ultra high efficiency is not needed for occasional usage at a cottage is the   
   OP asked about and would never pay for itself.   
      
      
   --------   
   "bob haller"  wrote in message   
   news:f918c5ed-aaa8-4a8f-9185-8011ff9ef217@n13g2000vbv.googlegroups.com...   
   most home water tank type heaters are set at 140 degrees to support   
   dishwasher operations.   
   so your 104F output water will get you a cool shower with dirty   
   dishes.....   
   your far better off with a vectra high efficeny condensing heater. it   
   combines the best of both worlds but is costly   
      
      
   > 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.   
   >   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)