Replies

1. 
   josh_jones|Jan 01, 2022 09:05pm|#1

   I think it depends on relative energy cost and availability. Demand (I assume you mean tankless) generally require quite a bit of instantaneous energy but are efficient because they only use energy while hot water is demanded. From what I remember - electric demand heaters get pretty ridiculous with their electrical requirements (over 100A depending on how much flow you need). Not sure about gas flow requirements for propane. If you go with a tank style unit, I'd consider a heat pump unit. We've had one for a few years now and I have yet to exhaust its capacity.

1. 
   EhvC|Jan 01, 2022 09:19pm|#2

   Thanks Josh, you have a geothermal heatpump with the hot water option?

1. 
   josh_jones|Jan 01, 2022 09:24pm|#3

   Nope - air source. Rheem 50 gallon. It can also do electric only or high-demand (electric + heat pump).

2. 
   josh_jones|Jan 01, 2022 10:46pm|#4

   EHVC-我碰巧发现了这篇文章 - 所描述的单位与我的成分相同（我认为这比我的单位更大）。//m.etiketa4.com/article/living-with-a-heat-pump-water-heater

2. 
   Paul Wiedefeld|Jan 02, 2022 11:39am|#5

   Propane and electric resistance are probably similar operating cost wise. If you want the most efficient option, then heat pump. Either way, a tank is better, tankless comes with many compromises. Reducing demand (low flow shower heads) and a drain water heat recovery pipe both cheaply and reliably save energy and add capacity.

1. 
   josh_jones|Jan 02, 2022 12:20pm|#6

   我同意 - 一个坦克，尤其是在热泵加热时 - 是必经之路。我不确定它是否有助于提高效率，但我还添加了一个恒温混合阀并将储罐温度提高到140度。混合阀混合在冷水中，将温度降低到您设置的任何东西（在我的情况下为125度）。这肯定会扩大能力。即使是同时执行几项热水任务（淋浴，洗碗机，洗衣服等），我还没有用完热水。这样做还可以使您可以使用更热的水作为电器，并将水槽和淋浴水调节至安全的水平。

   At the end of the day - all I know is my electric bill went down noticeably once I installed my heat pump water heater.

2. 
   EhvC|Jan 02, 2022 01:24pm|#7

   Thanks. Makes sense

3. 
   Andy Fellenz|2022年1月2日05:02 pm|#8

   One of my son's installed an air source heat pump water heater last year. There are two people in the house and they always have sufficient hot water. The water heater is also noticeably cheaper to run than the propane heater they replaced.

4. 
   Daniel Allen|2022年1月03,01:10pm|#9

   I like to have a tank for emergency water supply. More of a concern in California with earthquakes.

1. 
   josh_jones|Jan 03, 2022 01:33pm|#11

   Good point. Unintended benefit for me - being that I also live in a seismic area (Western Washington).

5. GBA Editor
   Kiley Jacques|Jan 03, 2022 01:26pm|#10

   I recommend you join us on the BS* + Beer Show this Thursday at 6PM ET. Allison Bailes will be talking about residential hot water distribution systems and is bound to talk about water heaters. You can also ask for his opinion directly from the chat box. (Usethis linkto register--it's free.)