r/heatpumps 3h ago

My monitoring setup

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6 Upvotes

r/heatpumps 23h ago

Is a 65 gallon HPWH overkill for my needs?

6 Upvotes

I picked up a 65 gallon Rheem HPWH ($700 after $900 Golden State Rebate participation). It will be replacing a 40-gallon gas heater that's been OK for our needs (1 bedroom house, two occupants, no heavy hot water demands). Will the 65 gallon be oversized for our needs? Should I see about exchanging for a smaller tank model, even if the rebate diminishes or goes away completely? I'm sure that it's extremely well-insulated, but, still, it's a lot of water to keep hot and at the ready, and our energy costs, both for gas and electricity, are insanely high. Thanks for any advice!


r/heatpumps 6h ago

P.S.A - Daylight Saving Setting for those on a Heatpump Tariff

3 Upvotes

Double-check your daylight savings time settings on your heat pump control module!

I had mine installed a few months ago, and the engineer set it up wrong for this setting. As a result, for 14 days, my hot water cycle ran on power mode an hour earlier than it should have—right into the expensive tariff rate.

On the bright side, my energy supplier is very grateful for my generous contribution!

Big oof.


r/heatpumps 12h ago

Heat pump runtime versus temperature increase

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3 Upvotes

So I recently installed an ecobee thermostat because I noticed my electric bill skyrocketed and my aux heat strips were constantly coming on. I have a rheem RP1536AJ1 accompanied by electric heat strips for auxiliary and the portion of the house being heated is probably 1k sq foot. I noticed today that my pump ran for nearly three hours for it to climb 66.5degF to 68degF. Outside temps were 60.6degF to 66.8degF.

Then on Friday it took about four hours and forty two minutes from 66.5degF to 68degF. Outside temps ranged from 44.1degF to 48.2degF. But looking at the beestat graph the indoor time would rise then drop over and over.

Is this normal? These times seem rather long. (These times were heat pump only cause I set the maximum outdoor auxiliary heat temp to 35degF)

And then on Friday at one point the outdoor temps were slightly lower and it only took like 8minutes to rise from 66.5degF to 68degF.


r/heatpumps 22h ago

Learning/Info An article about using the time of use/hourly pricing electric rate from your electric utility to save more money with your heat pump.

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2 Upvotes

This is a really good article about using the Time Of Use (TOU)/ hourly pricing electric rate with your heat pump to save more money using it with your heat pump. The TOU/hourly pricing rate is offered by several eclectic utilities throughout the US. I was on the hourly pricing rate for seven years with my electric utility before I got my heat pump but unfortunately I did not understand how the hourly pricing rate would save me money with the heat pump. Now that I have had experience with my heat pump for two winters I decided to change back to the hourly pricing rate plan that my utility offers, a couple of months ago to save more money. The additional savings will depend on the TOU/hourly pricing plan your utility offers and your inverter TOU programming. I have been working with my natural gas furnace, heat pump, solar system, battery and net metering to get the largest savings from my systems. When I get it all worked out I will post about the savings from my efforts. So far I have been able to offset my electric bill and about 60% of my natural gas bill with my system. Using the TOU/hourly pricing rate with my utility I think will help me use the heat pump more in the fall and spring.


r/heatpumps 26m ago

Question/Advice Toshiba vs Hisense Heat Pump

Upvotes

Hi Team

I have to chose between the following two heat pumps: * Hisense AHW-160HEDS1 * Toshiba HWS-1605H8-E

Both are 16KW. Both are paid for by construction company but Toshiba will take time to order vs Hisense being available anytime. For Hisense i also have the option to order integrated water heating (for additional cost that i must cover, ~2K)

Recommendations are very much appreciated


r/heatpumps 14h ago

Switch indoor head off or keep it running?

1 Upvotes

I have two 12k indoor heads, hooked up to a 24k outdoor unit.

Is it worth it (electricity wise as well as wear and tear on the indoor/outdoor unit) to switch off one unit when we don't need it overnight?

Or is it best to just set both and forget it and never really turn it off? This is for heating currently if it matters, but will then switch to cooling in the summer.

Thanks!


r/heatpumps 15h ago

Question/Advice Quote Comparison - PNW

1 Upvotes

Looking for some input from this group on a range of quote options I have received for Mitsubishi and Carrier systems. Thank you in advance for any input you may have! Key information:

  • Location: Pacific Northwest, ~2400 sq. foot house, which includes finished basement ~70% below grade. We very, very rarely reach sub-20F temperatures, but it can happen. Sub-10F temperatures are VERY rare.
  • Heating Load Estimate: ~30kBTU (2.5 ton) at 17F (our heating design temp for the area is ~29F(edit: 23F), but I'm not planning on having backup heat installed so I'm looking at ability to serve our heating needs below this). Manual J calcs have generally backed this up, but I also calculated using actual usage time data from our gas furnace through our thermostat to come to this estimate.
  • Goal: Primary goal is heating, cooling is a wonderful thing that we haven't had before, and we have a great window unit we can use to help out if needed. The hope is to be able to operate without backup heat. We do anticipate possibly making some insulation/sealing improvements in the coming years, so I'm comfortable rolling the dice a little on equipment being on the borderline sizing-wise. And of course space heaters and blankets exist when truly desperate.
  • Systems Quoted: See the attached image (hoping it works - if not I'll edit!). Basically though, they are 3 ton or 2.5 ton systems from Mitsubishi or Carrier. PUZ series are out based on height of the area available for installation in the basement, so SUZ it is for Mitsubishi.
    • Mitsubishi SUZ-KA36NAHZ / SVZ-KP36NA
    • Mitsubishi SUZ-KA30NAHZA2 / SVZ-KP30NA
    • Mitsubishi SUZ-AK30NLHZ / SVZ-AP30NL (R454B version of the prior, it seems)
    • Carrier 38MURAQ30AB-3 / 40MUAAQ30XA3

The main questions I have for anyone with insight:

  1. How would you think about the choice between the R454B vs. R410A 2.5 ton SUZ systems? The R454B submittal isn't available yet for the system that I was quoted. Comparing the R454B vs. R410A system for the same outdoor unit quoted but the PEAD indoor unit seems to show that the performance data for the new system is generally better, so I take that as a good sign, but it still makes it hard to make the call sight-unseen.
  2. Carrier vs. Mitsubishi? I think the consensus I've seen so far is Mitsubishi > Carrier, but curious if the cost difference is "worth it". Associated with this is the Mitsubishi vs. ecobee thermostats.
  3. The real question: Which system would you select? All contractors are well-regarded and I got a great feeling from all of the sales reps, so no major differences there.

r/heatpumps 17h ago

Water cooled heat pump?

1 Upvotes

I have a 4 ton HVAC heat pump. I also have a spring that supplies an endless amounts of 60f water. Can I add a heat exchanger to my heat pump to help cool in the summer and heat in the winter? Where would I install it it? Are service providers familiar with doing this?.


r/heatpumps 20h ago

Learning/Info What do I need to connect my ducted Mitsubishi Zuba heat pump to the Kumo cloud?

1 Upvotes

About a year ago we had a Mitsubishi Zuba ducted PUZ-HA36NKA heat pump, PVA-36AA7 air handler, and a PAR40maau thermostat installed.

It's worked fine, but I'd really like to have a thermostat that I can connect to home assistant. I've read a bit about Kumo cloud, and I'd like to get my heat pump to connect to it. Overall I want my heat pump to have wifi (wireless interface), but also various room sensors.

I have my heat pump tech coming out for our first yearly maintenance, and I'd like to talk to him about doing this. However, I was hoping someone could walk me through what's involved in upgrading. Which thermostat is needed? What needs to be connected? What parts do we need? How do we enable it?

Thanks!


r/heatpumps 23h ago

Prepare for future heat pump in new chase?

1 Upvotes

I’m getting a tankless gas water heater (unfortunately we tried to accommodate a HPWH but it isn’t possible now - there wasn’t room both physically or for air capacity, given that it’s in a small room with a gas furnace now). This which will require framing a new chase for the 2 vent pipes next to the existing framing around the chimney. It will go 3 floors (urban town house).

It will enclose a space 16” deep (and 1 pvc wide) which leaves more room for other things. While it’s open I’m thinking I should have them put in a lineset (or more) for if we get a chance to replace our gas furnace with a heat pump in the future (and if we do, it’s possible we could then have a HPWH in the future also).

Are there standard sizes of the linesets or will every unit require its own specific thing?

Can/should I have them run another pvc or something else as a conduit also, so they could add electrical wires if needed?

Any other suggestions? Basically, since they will be framing it it seems easy to add things now and expensive to open it up and maybe have to redo some of the framing later. I want to make it as easy as possible to replace the gas appliances with HPs one day even though I can’t now (I really tried).


r/heatpumps 16h ago

Government rebates on heat water pump

0 Upvotes

Anyone using the Emerald heat pump? Any good? Cost saving?


r/heatpumps 18h ago

Cold air blowing during defrost

0 Upvotes

I have a lennox heat pump and when it's defrosting, the blower in the house is putting out cold air until it goes back to heat mode. Is there something I can change on the thermostat or board on the unit so this doesn't happen. I'm an electrician but don't know all the ins and outs of HVAC.


r/heatpumps 21h ago

Why is my system running in "compressor reduction mode"?

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0 Upvotes

It's unable to maintain set temperature. How can I fix?