Revisiting hot water heat pumps

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#3424249 12-Oct-2025 09:38

a quick google search says to do the following

"Download the \"Hi Rheem\" app and follow the in-app instructions"

https://files.myrheem.com/webpartners/ProductDocuments/8EC45CF4-8782-4BF4-98C9-766CFBF2C05C.pdf

timbosan

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#3424250 12-Oct-2025 09:41

Jase2985:

a quick google search says to do the following

"Download the \"Hi Rheem\" app and follow the in-app instructions"

https://files.myrheem.com/webpartners/ProductDocuments/8EC45CF4-8782-4BF4-98C9-766CFBF2C05C.pdf

Wow thanks! My Google skills are obviously not good today, I did all this before hand :-( Looks like another Tuya clone app, I will give a try!

sharma

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#3431617 6-Nov-2025 13:28

jjones:

Anywho pulled the trigger on the Carrier Blue with A2W. Also converting my gas cooking to LPG.

How did it go? I am looking to get the same unit as well after replacing gas cooking and hotwater. Any feedback after the first few weeks on Carrier? I saw there was another person who started the Carrier sub-thread so keen to know from them too. They seem to be a bit competitively priced vs the other common big brands.

jjones

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#3431621 6-Nov-2025 13:36

sharma:

jjones:

Anywho pulled the trigger on the Carrier Blue with A2W. Also converting my gas cooking to LPG.

How did it go? I am looking to get the same unit as well after replacing gas cooking and hotwater. Any feedback after the first few weeks on Carrier? I saw there was another person who started the Carrier sub-thread so keen to know from them too. They seem to be a bit competitively priced vs the other common big brands.

Carrier blue works well for us. The app definitely helps if you want to tweak the schedule and how you want your water to be heated. It starts to heat from 48 degree to a max of 70. The lpg conversion is great as I can still use gas for cooking.

Reduced energy bill by more than a 100. And my solar is not yet installed.

sharma

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Wannabe Geek

#3431634 6-Nov-2025 14:01

Oh nice. I currently have gas for cooking and hot water. Current usage is 5000 units/year of gas and 4000 units/year of electricity.

Getting a 10kW solar setup next week without batteries. Decided to chop gas instead of batteries as its better ROI for me with ever increasing prices. It means I have to either choose a standard electric cylinder or a heat pump one for our hotwater and I got quoted (including disconnting gas) $8,000 for the 340l Rinnai HydraHeat Heat Pump installation OR $7,000 for the Carrier Blue model installation.

Going with a standard electric cylinder is going to be $2.5-$3K cheaper but it looks like I will have ~$500 more spend/loss in net annual power either via grid consumption or by selling less solar in summer. Which is making me think the Heat Pump option is worth pursuing. I just can't seem to find long term reviews on the Rinnai or the Carrier brand, so that makes me nervous.

jjones

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#3431643 6-Nov-2025 14:18

sharma:

Oh nice. I currently have gas for cooking and hot water. Current usage is 5000 units/year of gas and 4000 units/year of electricity.

Getting a 10kW solar setup next week without batteries. Decided to chop gas instead of batteries as its better ROI for me with ever increasing prices. It means I have to either choose a standard electric cylinder or a heat pump one for our hotwater and I got quoted (including disconnting gas) $8,000 for the 340l Rinnai HydraHeat Heat Pump installation OR $7,000 for the Carrier Blue model installation.

Going with a standard electric cylinder is going to be $2.5-$3K cheaper but it looks like I will have ~$500 more spend/loss in net annual power either via grid consumption or by selling less solar in summer. Which is making me think the Heat Pump option is worth pursuing. I just can't seem to find long term reviews on the Rinnai or the Carrier brand, so that makes me nervous.

The hot water heatpump can do full heat pump, heating element or hybrid. So if there's strong demand for hot water you can set to hybrid to heat it faster.

sharma

3 posts

Wannabe Geek

#3431650 6-Nov-2025 14:28

jjones:

sharma:

Oh nice. I currently have gas for cooking and hot water. Current usage is 5000 units/year of gas and 4000 units/year of electricity.

Getting a 10kW solar setup next week without batteries. Decided to chop gas instead of batteries as its better ROI for me with ever increasing prices. It means I have to either choose a standard electric cylinder or a heat pump one for our hotwater and I got quoted (including disconnting gas) $8,000 for the 340l Rinnai HydraHeat Heat Pump installation OR $7,000 for the Carrier Blue model installation.

Going with a standard electric cylinder is going to be $2.5-$3K cheaper but it looks like I will have ~$500 more spend/loss in net annual power either via grid consumption or by selling less solar in summer. Which is making me think the Heat Pump option is worth pursuing. I just can't seem to find long term reviews on the Rinnai or the Carrier brand, so that makes me nervous.

The hot water heatpump can do full heat pump, heating element or hybrid. So if there's strong demand for hot water you can set to hybrid to heat it faster.

Yeah I am aware of that. I was more concerned about its long term maintenance and reliability. I am seeing mixed short term reviews from plumbers and users at the moment.

jjones

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#3431659 6-Nov-2025 15:11

The annode is electrified so in theory you should not replace it in its lifetime. Based on the build and quality I reckon this will last atleast 10 years. Hot water heatpumps are also getting better and cheaper.

meeekael

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#3435599 18-Nov-2025 16:21

I see a lot of Indoor/Outdoor on the CO2 heatpump install specs for the cylinders and a few "great for a garage" but I need it totally outside.

Can the cylinders be installed outdoors?

jjones

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#3435635 18-Nov-2025 17:00

meeekael:

I see a lot of Indoor/Outdoor on the CO2 heatpump install specs for the cylinders and a few "great for a garage" but I need it totally outside.

Can the cylinders be installed outdoors?

Yes. Get a cylinder that is well insulated for outdoors.

WWHB

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#3435784 18-Nov-2025 19:43

meeekael:

I see a lot of Indoor/Outdoor on the CO2 heatpump install specs for the cylinders and a few "great for a garage" but I need it totally outside.

Can the cylinders be installed outdoors?

look at Sanden Ecoplus and Reclaim as well as Panasonic these are all CO2 split systems with a seperate compressor and cylinder. Every one I have installed the full system has been installed outdoors

Saor Alba

jjones

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#3435785 18-Nov-2025 19:48

Yes the Mitsubishi and panasonic are your best choice. They are very expensive systems though. For panasonic got quoted for 11.5K.

Kickinbac

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#3435874 18-Nov-2025 23:03

meeekael:

I see a lot of Indoor/Outdoor on the CO2 heatpump install specs for the cylinders and a few "great for a garage" but I need it totally outside.

Can the cylinders be installed outdoors?

Outdoor cylinders are fairly common, the outer case is usually made of colorsteel.

Rickles

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#3436598 22-Nov-2025 11:09

I've been watching this discussion with great interest, given the ongoing 'state' of natural gas supply in NZ.

Today I noticed that for the first time ever, the gas component of my power bill is now higher than the electricity component!

DjShadow

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#3470670 15-Mar-2026 19:16

If anyone in the Wellington Region wanting to get a Hot Water Heat Pump installed, the plumber I used (A2W from Lyall Bay) is running a Friends and Family special currently which is $300 off the quote they provide. PM me and I can forward the e-mail.

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