DrakeWe have used 40 to 80 gallon water heaters mainly the Rheem Marathon
electric units, we used 15 minutes per person twice a day on the timer, we did
use 7 day timers to have different start times on the weekends. We had great
success with that as a base line.Jerry
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Darryl Thayer <[email protected]>
Date: 3/14/18 4:14 PM (GMT-10:00)
To: RE-wrenches <[email protected]>
Subject: Re: [RE-wrenches] Electric Water kWh/ person
Sorry to say nothing, but a few years ago I did a study on off grid and on grid
houses and some had electric resistance water heaters and one with a Heat pump
water heater. If I can find the data I will send. However, it varied a lot
most the families were for 2 or 3 people The variation made it seem like my
study was of little value. except for the family with a heat pump water heater
used about 1/4 the electricity of the other.
On Wed, Mar 14, 2018 at 6:19 PM, <[email protected]> wrote:
Hello Wrenches,
Is there a good way to estimate the power that will be consumed for electric
water per person per day? We are estimating the amount of power that will be
used by an all electric duplex, and the water heater amount seems high. The
current model we have claims 3493 kWh/ year per 26 gallon tank will be
consumed. With the two units, that would add up to 6986 kWh / year for hot
water, pushing the system size to humongous for a 1300 ft sq building.
Does that seem high? There will be a maximum of 2 people per unit.
The owner is considering going to 115 V units with a 15 gallon tanks. I think
the smaller tank would help, but it would seem that the amount of hot water
consumed would be the main issue.
How can we get a good estimate for a per person energy usage for electric hot
water? Any other suggestions are welcome.
Thank you,
Drake
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