AMEN! When I installed my heatpump wter heater, I kept the old one. Put them in series so that the heatpump first heats the 50F incoming city water to about 100F (intentionally set that low so that the heatpumps is operating most efficiently). Then that water goes into the old electic tank where the top coil is set to 110F. So most of the heating is at the very high efficiency of the heatpump unit.
Wrapped them both in 4" insulation. And by only setting a final temp of 110F, the wife can still take a HOT shower, though she is burning through 90% hot water and 10% cold to get the right temp. We can do this at this low temperature because of the 100 gallons of hot water available. Bob -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of ROBERT via EV Sent: Wednesday, November 29, 2017 12:05 AM To: Electric Vehicle Discussion List Cc: ROBERT Subject: Re: [EVDL] Heat pump vs resistive Heater (OT, but somewhat EV related) You guys are correct about a heat pump being more energy efficiency than a resistance heating element. I recently installed a hybrid hot water heater. I have an external energy monitor on this circuit. The hybrid hot water heater used 1/4 the energy of a standard hot water heater. With the tax credit, the heater will pay for itself in 4 years. ________________________________ From: EV <[email protected]> on behalf of John Lussmyer via EV <[email protected]> Sent: Tuesday, November 28, 2017 9:17 PM To: Electric Vehicle Discussion List Cc: John Lussmyer Subject: Re: [EVDL] Heat pump vs resistive Heater (OT, but somewhat EV related) On Tue Nov 28 20:11:48 PST 2017 [email protected] said: >Heat can't magically be obtained from cold air. > >As the temperature drops, the pump must do a lot more work for an ever >smaller amount of heat. The one I just had put in the cabin is better than an electric heater down to around 0 deg F. Around here, dropping below freezing is rare event. -- Try my Sensible Email package! https://sourceforge.net/projects/sensibleemail/ SensibleEmail download | SourceForge.net<https://sourceforge.net/projects/sensibleemail/> sourceforge.net Download SensibleEmail for free. Email client based on the Eclipse RCP platform. Email client designed to be reliable, and easy to use. All email is kept in a SQL ... _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub [http://www.evdl.org/images/evdl.jpg]<http://www.evdl.org/help/index.html# usub> EVDL Subscription Information and Help<http://www.evdl.org/help/index.html#usub> www.evdl.org About the EVDL: The Electric Vehicle Discussion List, founded in 1991 by EV enthusiast Clyde Visser, is an active and vital source of information and help for people ... http://lists.evdl.org/listinfo.cgi/ev-evdl.org EV -- Electric Vehicle Discussion List - lists.evdl.org ...<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> lists.evdl.org The Electric Vehicle Discussion List is a forum for discussing the current state of the art and future direction of electric vehicles (EVs). We define an EV as a ... Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) [https://s1.yimg.com/dh/ap/default/130909/y_200_a.png]<http://groups.yahoo .com/group/NEDRA> Yahoo! Groups<http://groups.yahoo.com/group/NEDRA> groups.yahoo.com / -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20171129/d14fcd 0b/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
