Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

149 posts

Master Geek

Topic # 54260 16-Dec-2009 15:47
Send private message

We are thinking of getting an air con system in our home - mainly for summer cooling. I know there are also heatpump water heaters available.

Has anyone seen, in NZ,  a combination heatpump air con unit that heats your household water while returning the "waste" cool air back into the house. No-one in NZ seems to sell / offer this.

Create new topic
20799 posts

Uber Geek
+1 received by user: 4045


  Reply # 283575 17-Dec-2009 23:01
Send private message

No, I have asked someone who does refrigeration for a job why not, and basically the pressure is set for what temperature range you want, which makes its COP, if its got the pressure for hot water in it, then its lousy efficincy for a small temperature differential like cooling a house when its only a 15 degree difference between one side and the other.

That would make the costs overall worse than 2 seperate systems.

Also he didnt recommend the one outdoor unit and 2 indoor unit heatpumps for the same reason, its either efficiant with one running, or both running, of pretty poor effiancy in both configurations compared to getting 2 seperate inverter systems.


2584 posts

Uber Geek
+1 received by user: 5

Mod Emeritus
Lifetime subscriber

  Reply # 283612 18-Dec-2009 06:26
Send private message

We have a heat pump hot water cylinder and a separate heat pump for heating/cooling the house.

I think that unless you lived in a constantly hot climate the system that you are talking of would not really be useful at all. Even then having the times when you need the water cylinder to work verses when you need cooling would be at odds more often then not.

Media centre PC - Case Silverstone LC16M with 2 X 80mm AcoustiFan DustPROOF, MOBO Gigabyte MA785GT-UD3H, CPU AMD X2 240 under volted, RAM 4 Gig DDR3 1033, HDD 120Gig System/512Gig data, Tuners 2 X Hauppauge HVR-3000, 1 X HVR-2200, Video Palit GT 220, Sound Realtek 886A HD (onboard), Optical LiteOn DH-401S Blue-ray using TotalMedia Theatre Power Corsair VX Series, 450W ATX PSU OS Windows 7 x64


149 posts

Master Geek

  Reply # 283866 18-Dec-2009 19:02
Send private message

Thanks guys.

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Windows no longer Microsoft’s main focus
Posted 13-Mar-2018 07:47

Why phone makers are obsessed with cameras
Posted 11-Mar-2018 12:25

New Zealand Adopts International Open Data Charter
Posted 3-Mar-2018 12:48

Shipments tumble as NZ phone upgrades slow
Posted 2-Mar-2018 11:48

Oppo R11s: high-end Android, budget price
Posted 27-Feb-2018 16:27

Samsung New Zealand introducing the Galaxy S9 and S9+
Posted 26-Feb-2018 07:00

Fujifilm X beats its best with new top of the range, high-performance camera
Posted 24-Feb-2018 14:05

One million kiwis affected by cybercrime
Posted 24-Feb-2018 13:58

New Zealanders want to engage with government online and via mobile apps
Posted 24-Feb-2018 13:56

Samsung launches Samsung Max
Posted 24-Feb-2018 13:52

CPTPP text and National Interest Analysis released for public scrutiny
Posted 21-Feb-2018 19:43

Foodstuffs to trial digitised shopping trolleys
Posted 21-Feb-2018 18:27

2018: The year of zero-login, smart cars & the biometrics of things
Posted 21-Feb-2018 18:25

Intel reimagines data centre storage with new 3D NAND SSDs
Posted 16-Feb-2018 15:21

Ground-breaking business programme begins in Hamilton
Posted 16-Feb-2018 10:18

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.