Add-on Hot water Heat pump

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Smoke
Posts: 149
Joined: Thu Aug 30, 2018 12:45 pm

Add-on Hot water Heat pump

Post by Smoke » Fri Oct 12, 2018 11:07 am

Reaching out to anyone that may know of an "add-on" air source heat pump for a water heater in the USA home application.
I currently have a Geyser made by Nyle systems 9 yrs running, still works just fine, but looking for a replacement for it's eventual demise.
I know about built in units with a water heater, not looking for those. Not looking for solar, not looking for desuperheater.

It seems like no one sells one anymore in the USA market, there used to be half a dozen or so 10 yrs ago.
Nyle no longer makes the Geyser, only industrial units :moneybag

My current unit https://www.homepower.com/stand-alone-heat-pumps

earlyout
Posts: 1362
Joined: Tue Feb 20, 2007 5:24 pm

Re: Add-on Hot water Heat pump

Post by earlyout » Fri Oct 12, 2018 11:22 am

What's the purpose of the heat pump? Wouldn't they have to be almost 100% efficient to save any energy?

Smoke
Posts: 149
Joined: Thu Aug 30, 2018 12:45 pm

Re: Add-on Hot water Heat pump

Post by Smoke » Fri Oct 12, 2018 11:34 am

earlyout wrote:
Fri Oct 12, 2018 11:22 am
What's the purpose of the heat pump? Wouldn't they have to be almost 100% efficient to save any energy?
It heats hot water :D
That aside, having a unit for 9 yrs and checking it with a killowatt meter I can say that the unit "cooks" all my hot water needs for $150 per year as opposed to aprox $500 per year with an electric tank. Circuit breaker for tank turned off all the time.
Plus... it Dehumidifies my unconditioned basement/crawlspace as a no cost bonus.

money_bunny
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Joined: Tue Dec 20, 2016 9:33 pm

Re: Add-on Hot water Heat pump

Post by money_bunny » Fri Oct 12, 2018 11:37 am

I think they stopped making the Nyle add on system. Which is a shame because it was to the best of my knowledge the only 120V system on the market. I was thinking about using that setup with a set of solar panels and not having to buy a 220v inverter just for the hot water system.

Smoke
Posts: 149
Joined: Thu Aug 30, 2018 12:45 pm

Re: Add-on Hot water Heat pump

Post by Smoke » Fri Oct 12, 2018 11:39 am

money_bunny wrote:
Fri Oct 12, 2018 11:37 am
I think they stopped making the Nyle add on system. Which is a shame because it was to the best of my knowledge the only 120V system on the market. I was thinking about using that setup with a set of solar panels and not having to buy a 220v inverter just for the hot water system.
Yes I had contacted the company (Nyle) and they said it was unprofitable to continue manufacturing the unit.
Yes it is/was 120v

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hand
Posts: 1217
Joined: Sun May 17, 2009 8:42 pm

Re: Add-on Hot water Heat pump

Post by hand » Fri Oct 12, 2018 12:10 pm

earlyout wrote:
Fri Oct 12, 2018 11:22 am
What's the purpose of the heat pump? Wouldn't they have to be almost 100% efficient to save any energy?
Because heat pumps move heat rather than creating heat, they can be more than 100% efficient (e.g. they add more heat than they consume) allowing for significant savings vs. resistance heat.

Valuethinker
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Re: Add-on Hot water Heat pump

Post by Valuethinker » Fri Oct 12, 2018 6:25 pm

hand wrote:
Fri Oct 12, 2018 12:10 pm
earlyout wrote:
Fri Oct 12, 2018 11:22 am
What's the purpose of the heat pump? Wouldn't they have to be almost 100% efficient to save any energy?
Because heat pumps move heat rather than creating heat, they can be more than 100% efficient (e.g. they add more heat than they consume) allowing for significant savings vs. resistance heat.
And a typical efficiency in this application might be 200 to 300 per cent.

If gas is not an option for HW heating or you live in New England where gas is expensive then it might well pay off.

money_bunny
Posts: 56
Joined: Tue Dec 20, 2016 9:33 pm

Re: Add-on Hot water Heat pump

Post by money_bunny » Thu Nov 08, 2018 12:42 pm

I would consider building one if I had the HVAC tools around.

brianH
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Re: Add-on Hot water Heat pump

Post by brianH » Thu Nov 08, 2018 2:43 pm

Valuethinker wrote:
Fri Oct 12, 2018 6:25 pm
If gas is not an option for HW heating or you live in New England where gas is expensive then it might well pay off.
It almost definitely pays off if your only other option is electric elements. The prices of HPWH have come down enough that unless you're paying some super-cheap electric rates, you'll probably save $150-300/yr for a ~$600 premium on the unit's price over a comparable electric.

If only the HP-based clothes dryers had the same payback. As a no-natural-gas-haver, I can't wait for those to get better/cheaper.

g2morrow
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Joined: Thu Jun 07, 2018 7:23 am

Re: Add-on Hot water Heat pump

Post by g2morrow » Thu Nov 08, 2018 3:03 pm

I know its not what you're looking for but they do make water heaters that use a heat pump - they are waaaay more expensive but make it up for it with the low use cost.

Smoke
Posts: 149
Joined: Thu Aug 30, 2018 12:45 pm

Re: Add-on Hot water Heat pump

Post by Smoke » Thu Nov 08, 2018 5:23 pm

g2morrow wrote:
Thu Nov 08, 2018 3:03 pm
I know its not what you're looking for but they do make water heaters that use a heat pump - they are waaaay more expensive but make it up for it with the low use cost.
Yes, I know about them. I have never had one but I will assume the savings are similar.
The issue I have with them is, it's a one piece unit. Either fails and replace the whole unit, especially if it is the tank that fails.
I would rather have a separate unit for that reason. And my current Tank is only one yr old.
Heat pump is still working but is 11 yrs old now, and I am just looking for options if it should/will fail.

graviteer
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Joined: Sat Aug 19, 2017 9:30 pm

Re: Add-on Hot water Heat pump

Post by graviteer » Thu Nov 08, 2018 6:06 pm

The Sanden SANCO2 is a highly efficient split system. It is pricey, and probably not designed to be retrofitted to an existing tank. But its tank and outdoor unit can be serviced separately, if either one fails.

Smoke
Posts: 149
Joined: Thu Aug 30, 2018 12:45 pm

Re: Add-on Hot water Heat pump

Post by Smoke » Thu Nov 08, 2018 6:49 pm

graviteer wrote:
Thu Nov 08, 2018 6:06 pm
The Sanden SANCO2 is a highly efficient split system. It is pricey, and probably not designed to be retrofitted to an existing tank. But its tank and outdoor unit can be serviced separately, if either one fails.
Ouch, aprox 4k for the unit(s) thanks for the info I had not come across this in my searching before :beer

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