Revisiting hot water heat pumps

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WWHB

57 posts

Master Geek
+1 received by user: 48

#3499688 3-Jun-2026 07:18

Perchy:

We are looking at getting a heat pump hwc for our new build, and have been quoted for a 250L Haier monoblock model. Wondering how these are? Ideally not wanting to end up spending too much, but also wondering whether it's worth spending extra for a split system, or a co2 system? Will have 3-4 people living here.

Get the largest size you can afford. The downside to their efficiency is they have a much slower recovery if you run out of hot water. The exception to this are the CO2 systems but you will pay more for them. I have put in a CO2 system (315litre cylinder)in for a family of 8 and they never run out of hot water due to the must faster recovery.

Saor Alba

johno1234

3484 posts

Uber Geek
+1 received by user: 2974

#3499773 3-Jun-2026 09:46

Most hot water heat pump systems have an old fashioned resistive heating element to boost heating when the teenagers spend too long running the hot shower.

Kickinbac

482 posts

Ultimate Geek
+1 received by user: 102

#3499866 3-Jun-2026 12:16

Perchy:

We are looking at getting a heat pump hwc for our new build, and have been quoted for a 250L Haier monoblock model. Wondering how these are? Ideally not wanting to end up spending too much, but also wondering whether it's worth spending extra for a split system, or a co2 system? Will have 3-4 people living here.

It will be a decent price jump to get into a CO2 system so probably either need to be in a cold region or have high hot water use to justify depending on your circumstances. I have Panasonic CO2 and save average of $100 a month on my power bill. That's for 2 Adults & 2 teenagers with a 250 litre tank.

Look carefully the warranties and terminology. Haier isn't as good as others - 7 years on cylinder and 5 years on the refrigeration system. You can get systems with 7 or 10 year warranties. Gree has 7 year warranty. Carrier has 10 year warranty.

Look for terminology like 'sealed system' as this is the refrigeration system and probably the most costly to fix. Another example is Rheem Ambiheat - 7 years on cylinder but only 3 years on the sealed system!

JayADee

2254 posts

Uber Geek
+1 received by user: 498

#3500090 4-Jun-2026 08:21

Kickinbac:

Perchy:

We are looking at getting a heat pump hwc for our new build, and have been quoted for a 250L Haier monoblock model. Wondering how these are? Ideally not wanting to end up spending too much, but also wondering whether it's worth spending extra for a split system, or a co2 system? Will have 3-4 people living here.

It will be a decent price jump to get into a CO2 system so probably either need to be in a cold region or have high hot water use to justify depending on your circumstances. I have Panasonic CO2 and save average of $100 a month on my power bill. That's for 2 Adults & 2 teenagers with a 250 litre tank.

Look carefully the warranties and terminology. Haier isn't as good as others - 7 years on cylinder and 5 years on the refrigeration system. You can get systems with 7 or 10 year warranties. Gree has 7 year warranty. Carrier has 10 year warranty.

Look for terminology like 'sealed system' as this is the refrigeration system and probably the most costly to fix. Another example is Rheem Ambiheat - 7 years on cylinder but only 3 years on the sealed system!

Any suggestions of one to look at for two adults in Eastern Bay of Plenty? I want to switch from tanks of LPG next time my gas heater dies- LPG and tank rental has gone up enough to make switching worth it.

boland

569 posts

Ultimate Geek
+1 received by user: 90

#3500100 4-Jun-2026 08:37

Perchy:

We are looking at getting a heat pump hwc for our new build, and have been quoted for a 250L Haier monoblock model. Wondering how these are? Ideally not wanting to end up spending too much, but also wondering whether it's worth spending extra for a split system, or a co2 system? Will have 3-4 people living here.

We have the Gree Whio 270L and it's awesome, it's very quiet. It's enough for 4 people. It has 7 year warranty labour + parts, the best I could find.

JayADee

2254 posts

Uber Geek
+1 received by user: 498

#3500106 4-Jun-2026 08:47

boland:

Perchy:

We are looking at getting a heat pump hwc for our new build, and have been quoted for a 250L Haier monoblock model. Wondering how these are? Ideally not wanting to end up spending too much, but also wondering whether it's worth spending extra for a split system, or a co2 system? Will have 3-4 people living here.

We have the Gree Whio 270L and it's awesome, it's very quiet. It's enough for 4 people. It has 7 year warranty labour + parts, the best I could find.

Thank you I will check those out!

edit: yeah that looks perfect

Kickinbac

482 posts

Ultimate Geek
+1 received by user: 102

#3500109 4-Jun-2026 08:53

boland:

Perchy:

We are looking at getting a heat pump hwc for our new build, and have been quoted for a 250L Haier monoblock model. Wondering how these are? Ideally not wanting to end up spending too much, but also wondering whether it's worth spending extra for a split system, or a co2 system? Will have 3-4 people living here.

We have the Gree Whio 270L and it's awesome, it's very quiet. It's enough for 4 people. It has 7 year warranty labour + parts, the best I could find.

I second this. My workmate put one in last year and has no complaints. He is a fridgey loves Gree. He basically said he doesn't really think about it, it just works, lol. Which to me is all most people really want.

My advice is to consider the placement of the HWHP. It has a fan and compressor in it so be careful where it goes outside your house as there will be some noise, try to locate it away from bedroom windows etc.

boland

569 posts

Ultimate Geek
+1 received by user: 90

#3500120 4-Jun-2026 09:19

The Gree sits next to our ensuite, and we can hear it indeed slightly from the ensuite; but not from our bedroom.

It can also be connected to Home Assistant by the way via an unofficial integration I contributed to to make it work with the WHIO.

PolicyGuy

1835 posts

Uber Geek
+1 received by user: 1790

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Lifetime subscriber

#3500126 4-Jun-2026 09:23

Kickinbac:

My advice is to consider the placement of the HWHP. It has a fan and compressor in it so be careful where it goes outside your house as there will be some noise, try to locate it away from bedroom windows etc.

Don't worry about this too much, modern HWHP units are very quiet.

Mine is outside my bedroom window and if I wake up in the wee small hours when it's doing a top-up with cheap electricity, I can hear it - if I listen for it - as a gentle hum. It's nothing like noisy enough to keep me awake, let alone wake me up.
I'd say that proximity to bedroom windows is a low priority criterion for site selection.

Kickinbac

482 posts

Ultimate Geek
+1 received by user: 102

#3500147 4-Jun-2026 10:08

PolicyGuy:

Kickinbac:

My advice is to consider the placement of the HWHP. It has a fan and compressor in it so be careful where it goes outside your house as there will be some noise, try to locate it away from bedroom windows etc.

Don't worry about this too much, modern HWHP units are very quiet.

Mine is outside my bedroom window and if I wake up in the wee small hours when it's doing a top-up with cheap electricity, I can hear it - if I listen for it - as a gentle hum. It's nothing like noisy enough to keep me awake, let alone wake me up.
I'd say that proximity to bedroom windows is a low priority criterion for site selection.

Most plumbers will put it exactly where the old instantaneous gas unit was. Generally are not too loud but always best to consider noise as once its installed it costs to move it. Noise is subjective, what bothers me might not bother you.

My Panasonic CO2 system is so quiet outside that I need to be right next to it to know its running or notice the leaves moving from the airflow. However the cylinder is inside in a cupboard in our ensuite and I can hear the pump running and changing speed from the bedroom via noise transmission through the copper pipes. The pump is outside in the outdoor unit! It doesn't bother me as its a low level noise but I am aware of it.

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