Additional information about on-demand electric water heaters gathered from local electrician, Rob Orozco (Orozco Electric).
The Rinnai R75LSe Tankless Water Heaters should not be a problem with elevation/altitude or water temperature intake with low electrical demand -120volt-60hz-DC 12 volts controller (Normal: 50 watts, standby:2.0 watts, Anti-frost protection 100watts). Delivers 7.5 gallons of hot water per minute. Maximum temperature 120or 140F with option of 160F setting.
The site provides great info for homeowners and architects:
http://www.rinnai.us/tankless-water-heaters/r75lse/
The Rinnai would be a better choice than the Tempra24 which requires 2 independent 240V AC circuits protected by 2 separates 60amp breakers, requiring high electrical load. The minimum recommended electrical service is 180amps for the 24 models and 300amps for the 36 model. Yet, an on-demand gas hot water heater might be a more efficient choice as a back-up system…
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