Mine has a button that can switch it to simple resistive heat. I usually push that in the winter.
Mike On January 16, 2015 5:47:20 PM MST, Peri Hartman via EV <[email protected]> wrote: >Not that it would make a huge difference, but I question the value of a > >heat pump H/W heater in winter. If it's taking heat from your garage >or >basement, that is ultimately taking some heat from your heated spaces, >which means you're simply using more energy elsewhere. If you could >somehow duct the air intake from outside during winter, then it would >be >doing the best job it could. In summer, no doubt a true benefit. > >Before you argue that I'm wroing, consider this. If the air outside >your garage is colder than inside and the H/W tank is cooling the >garage >air in exchange for heating the water, either the garage temp will drop > >to less than the outside or warm air will be drawn from the home's >heated spaces. If you are truly insulated, then the former will >happen >and you will have the equivalent of ducting intake from outside. I >doubt that the normal case. > >Peri > > >------ Original Message ------ >From: "Mike Nickerson via EV" <[email protected]> >To: "Ben Goren" <[email protected]>; "Electric Vehicle Discussion >List" <[email protected]> >Sent: 15-Jan-15 9:04:35 PM >Subject: Re: [EVDL] EV Demand Response - (solar-thermal-NOT) > >>I have one of the heat pump water heaters. It basically looks like a >>normal water heater with a small heat pump on top. They blow the >cooler >>air out the top of the heat pump, so they can indeed be used to help >>with cooling in the summer. You need airflow around the area of the >>water heater to take advantage of the cooler air coming from the heat >>pump. >> >>Mike >> >>On January 14, 2015 9:39:18 AM MST, Ben Goren via EV >><[email protected]> wrote: >>>On Jan 12, 2015, at 8:35 PM, Robert Bruninga <[email protected]> >>>wrote: >>> >>>> Compare the 60% efficiency of the PV/Heatpump water heater to the >>>>50% >>>losses half the year of the 70% thermal panels and higher cost and >the >>>PV panels with heatpump water heating win hands down. >>> >>>I hadn't heard of heat pump water heaters before this discussion. >>>Something like that could, indeed, tip the balance. >>> >>>What happens to the cold side of the heat pump? Can that be used to >>>reduce air conditioning load in summer? >>> >>>As of a few years ago, the return on investment, the payback time, >for >>>solar hot water was better than that of PV -- and that included >>>maintenance every few years, electricity to heat the water on cloudy >>>days (though much less electricity since you still get a substantial >>>amount of warming), and so on. >>> >>>But it's obviously a rapidly-evolving field. If heat pumps really are >>>coming to water heaters, that's huge not just for PV adopters but >>>energy efficiency across the spectrum. >>> >>>If my own system lasts a few more years -- and there's no reason it >>>shouldn't last a few times a few more years -- then it'll have paid >>>for >>>itself. Be nice to make a sizable profit off of it by getting it to >>>last that "few times a few more years," but, if it dies prematurely, >I >>>suppose an all-electric replacement will have to be on the short list >>>as well as a drop-in equivalent replacement. >>> >>>b& >>>_______________________________________________ >>>UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >>>http://lists.evdl.org/listinfo.cgi/ev-evdl.org >>>For EV drag racing discussion, please use 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 >>For EV drag racing discussion, please use 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 >For EV drag racing discussion, please use 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 For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
