Gree WHIO Hot Water Heat Pump

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KiwiTim

406 posts

Ultimate Geek
+1 received by user: 62

#3424541 13-Oct-2025 09:28

The flow rate is slower, but not enough to make much difference. Our previous system was a Rinnai Infinity with a max flow rate of 26L/Min. We have good cold water pressure here, and I find the new flow rate quite satisfactory. Maybe if you had low water pressure, it might be less than satisfactory, but its perfectly fine here. Still get plenty of pressure in the shower. The temperature in the tank does vary quite a bit. First thing in the morning its about 58C, but at other times I have seen it as low as 37C, which still feels hot to me. I have the sunflower mode active, which means it heats at the warmest time of the day. I have not noticed much difference in power usage between now and prior to install, but I think the solar panels account for that.

I'll post a photo here later when I have a bit more time.

It is advised to not allow to let the unit sit in the rain or sunshine, so I made a little verandah for it, and located it under the eve on the south side of the house.

Moonshine

7 posts

Wannabe Geek
+1 received by user: 1

#3424551 13-Oct-2025 10:13

Thank you for your message.

The flow rate has been good for us because the Haier model comes with 20mm outlet.

It's good to hear similar experience regarding the temperature reading, this is the main concern for us as we have 7 people. I have found the if the temp is showing 30 degree below, it's definitely going to run out of hot water soon. I typically heat up the cylinder to 75 degrees during the night (off peak between 9pm and 7am), then heat again between 4/5pm and 7pm, this works for us.

When the solar is installed, I am hoping the electricity usage will come down. I am also planning to change the piped gas to cylinder, until this is done, the full benefit of going to electrical will then be more clear.

Thank you for sharing your experience.

Daynger

444 posts

Ultimate Geek
+1 received by user: 313

#3424915 14-Oct-2025 17:33

KiwiTim:

It is advised to not allow to let the unit sit in the rain or sunshine, so I made a little verandah for it, and located it under the eve on the south side of the house.

Is the heat pump unit and storage tank all one unit? So no separate outdoor unit like a typical heatpump, and so the entire unit sits outside?

But they want no sun or rain on it?

WWHB

56 posts

Master Geek
+1 received by user: 48

#3424950 15-Oct-2025 07:03

Moonshine:

Thank you for your message.

The flow rate has been good for us because the Haier model comes with 20mm outlet.

It's good to hear similar experience regarding the temperature reading, this is the main concern for us as we have 7 people. I have found the if the temp is showing 30 degree below, it's definitely going to run out of hot water soon. I typically heat up the cylinder to 75 degrees during the night (off peak between 9pm and 7am), then heat again between 4/5pm and 7pm, this works for us.

When the solar is installed, I am hoping the electricity usage will come down. I am also planning to change the piped gas to cylinder, until this is done, the full benefit of going to electrical will then be more clear.

Thank you for sharing your experience.

If you have 7 people in your home a 330litre hot water heat pump isn’t really suitable, well not an all in one type system.

I install a lot of hot water heat pumps it’s the main part of my business, as soon as you go over 6 people you need a CO2 split system like a Sanden, Reclaim or Panasonic with a 300 litre cylinder. The storage may be 30 litres less but the recovery is outstanding. The would recover between 150 and 180 litres an hour so from a cold start would give enough hot water for a shower in 20 mins. From my experience of supplying and installing the cost difference would be around $1000 to jump to a CO2 from the 330 Haier and this cost difference would be covered in your first years power savings.

Saor Alba

KiwiTim

406 posts

Ultimate Geek
+1 received by user: 62

#3425195 15-Oct-2025 20:21

Daynger:

KiwiTim:

It is advised to not allow to let the unit sit in the rain or sunshine, so I made a little verandah for it, and located it under the eve on the south side of the house.

Is the heat pump unit and storage tank all one unit? So no separate outdoor unit like a typical heatpump, and so the entire unit sits outside?

But they want no sun or rain on it?

Yes, it's all one monoblock unit. Entire unit sits outside. I assumed it was completely weather proof, but the instructions advised keeping it undercover, so that is what I have done.

Moonshine

7 posts

Wannabe Geek
+1 received by user: 1

#3425527 16-Oct-2025 16:42

WWHB:

Moonshine:

Thank you for your message.

The flow rate has been good for us because the Haier model comes with 20mm outlet.

It's good to hear similar experience regarding the temperature reading, this is the main concern for us as we have 7 people. I have found the if the temp is showing 30 degree below, it's definitely going to run out of hot water soon. I typically heat up the cylinder to 75 degrees during the night (off peak between 9pm and 7am), then heat again between 4/5pm and 7pm, this works for us.

When the solar is installed, I am hoping the electricity usage will come down. I am also planning to change the piped gas to cylinder, until this is done, the full benefit of going to electrical will then be more clear.

Thank you for sharing your experience.

If you have 7 people in your home a 330litre hot water heat pump isn’t really suitable, well not an all in one type system.

I install a lot of hot water heat pumps it’s the main part of my business, as soon as you go over 6 people you need a CO2 split system like a Sanden, Reclaim or Panasonic with a 300 litre cylinder. The storage may be 30 litres less but the recovery is outstanding. The would recover between 150 and 180 litres an hour so from a cold start would give enough hot water for a shower in 20 mins. From my experience of supplying and installing the cost difference would be around $1000 to jump to a CO2 from the 330 Haier and this cost difference would be covered in your first years power savings.

Thank you, when I first spoke to the Haier Rep, he also recommended the split system but when he visited my place he didn't mention it. After using the 330L system, I do agree a split system would worked better. Currently if I heat up overnight to 75 degrees and heat for 2 hours before 5pm, it works for the family needs. Currently running cost is about the same as using Infinity, but I am looking forward to solar install and then remove gas early next year, these would hopefully achieve some saving for us.

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