Browse Forums What's New Re: Hot water system (HWS) 21Dec 10, 2008 10:12 pm Coral Homes up here in QLD are pushing the heat pump systems, in the brochure it tells you your average hot water power cost for a year will average $100 total
it is listed this link as well --> http://www.yourhome.gov.au/technical/fs65.html Re: heat pump... 24Jan 18, 2009 5:34 am rogtat83 we are looking at using having a heat pump when we build our house, I think i understand the basic theory, but has anyone had any experience with one? ? I have heard they can be noisy at night , might be something to ask about ... Re: Hot water system (HWS) 25Jan 20, 2009 7:33 pm Hi Sting
My advice to to shop around on price before you decide 100%. I have gone with the Bosch 16H instant gas hydro ignition model, & lurve it. Actually ended up with a cheaper price from AGL after a phone call to them, cheaper than anything I found on the net (incl eBay) despite making lotsa other phone calls around. Re: Hot water system (HWS) 26Jan 22, 2009 3:21 pm I voted solar as that's the closest option to what I actually want to put in -> a combination of geothermal and solar, using that for hydronic floor heating too if possible. It's quite hard to work out what's best though since they seem to be fairly new :/ Re: Hot water system (HWS) 27Feb 15, 2009 12:11 pm well, heat pump has same principle as a fridge or an aircon. So, will be electric. But it uses about 1/3rd of the energy of heating it directly (via resistance).
Gas water heating is said to be less efficient in the warm, eg Queensland, comes handy in a Victorian winter. So maybe these guys are right in that electric is better. Or maybe some heat pump manufacturer has its mate in the QLD government. Gas has per KWH 1/3 of CO2 output than electric energy... Re: Hot water system (HWS) 28Feb 15, 2009 1:28 pm I wanted a gas unit but the cost of running it on bottles was too much, so ive gone with the heat pump Blog - http://snakedr.blogspot.com/ Build Thread - viewtopic.php?f=31&t=12084&p=307406#p307406 Status - PCI 15/10. Things nearly done. Re: Hot water system (HWS) 29Feb 15, 2009 3:48 pm We are getting a 'heat pump'. I have no idea what the difference is between it and a normal old electric one. It cost $980 to upgrade and supposedly it uses way less $$$ to run than the gas ones. Has anyone got one of these installed.... are they ok? Built a modified "Daydream 279" .. Cor@l Homes on a flat 4473m block!! And lov'n it!!! Re: Hot water system (HWS) 30Feb 15, 2009 4:47 pm they use approximately 25% of the energy as a standard electric unit if you read and believe what they tell you
they are supposed to make a little bit of noise however the brand our builder uses is quantum, coral uses another brand but it works well according to my brother who just built with coral heat pump info --> http://www.quantumenergy.com.au/about-q ... ed-12.aspx Blog - http://snakedr.blogspot.com/ Build Thread - viewtopic.php?f=31&t=12084&p=307406#p307406 Status - PCI 15/10. Things nearly done. dux heatpump for me 31Mar 18, 2009 8:42 pm Dux heatpump.... and pickup $1200 in REC's...
Is it noisy Hmmm a bit... Heaps of hot water beats the chip heater 20 years of stick collecting, glad that is over... and the fire risk, living on a bush block. Re: Hot water system (HWS) 32Jan 23, 2010 5:09 pm We installed a Quantum Heat pump after researching lots of different systems. We got a fairly large rebate from the Government but it was pretty expensive. (ie $4800) The first system we got ran into problems about 3 months before warranty ran out, but the company came down from Sydney and replaced it with a new system which runs much better. Pretty happy. Re: Hot water system (HWS) 33Mar 01, 2010 10:31 am Looks like we need a new HWS. Current 15 year old electric system is turning the water brown. I'd really appreciate any comments on heat pump and solar systems. Leaning towards heat pump for ease of replacement (after the trouble we had with replacing a bathroom exhaust fan and the trouble relatives had with antenna repairs, ie ROOF LEAKS , the thought of people traipsing around up there doesn't thrill me). I see noise can be an issue. Hopefully some of you have had your systems for a while and could comment on that, also reliability, and anything else we should be aware of. Re: Hot water system (HWS) 35Mar 10, 2010 9:08 am We are installing the Rinnai INFINITY 26 or the INFINITY 26Plus. Also in addition to that the Smartstart® Water Saver. With the water saver you push a button on one of the control panels in the house and the water in your pipes gets circulated through the heater. So that way when you turn on the hot water tap, there is only a fraction of a delay before the hot water comes out! No more standing outside the shower with a bucket in the shower collecting all the wasted cold water while waiting for the hot to come through. Re: Hot water system (HWS) 36Mar 13, 2010 12:05 pm Regarding heat pumps They produce roughly as much noise as an air conditioning unit. Rheem make two types. The 325 has the heating unit mounted on top. The 310 has the unit mounted on the side. Its marketed as being quieter. In my experience, its not that much quieter if at all. Ive installed quite a few of both. There is a third option that is somewhat smaller and can have the heating unit installed up to 4 mtrs from the storage unit, which might be a way of keeping the noise away from where the storage unit is positioned, but the installation costs are more expensive as the plumber has to run flow and return lines between the two units.Its an Everhot, which is a Rheem unit, sold under the name of everhot by Rheece plumbing supplies. The benefit of this one is, it has a 7 year warranty as opposed to a five year warranty As far as brands are concerned, Rheem is by far the best storage hot water manufacturer in aus. Their storage units last on average years longer than other manufacturers. I install hundreds of HW units a year and many of the Dux units I replace have lasted 6 years. Ive often replaced a Dux storage unit months after the waranty period has expired, wheras Rheem generally last 10 to 12 years. For this reason, Id caution anyone to stay away from Dux.Perhaps their heat pumps are better, but personally, I wouldnt take the risk. Heat pumps operate by taking ambient heat from the atmosphere and as such, produce hot water on rainy or cloudy days when solar units are using their booster element. Air is drawn into the heat pump via a fan into an evaporator containing a type of refrigerant, which is stored in piping. The refrigerant used is called R134a. R134a has an evaporation or boiling point of -26C; The air that has been drawn into the system, is far warmer than the refrigerant and turns the refrigerant from a liquid into a gas inside the heat pump's piping. A compressor then pumps the now gaseous refrigerant through a small valve, which compresses it; and as a result of the process generates a great deal of heat. A heat exchanger transfers the heat from the heated refrigerant gas pipes to a tank where water is stored. The downside of heat pumps is, that when your old storage unit needed repairs, it was simple to repair and parts were cheap. An element or a thermostat. With a heat pump, its an entirely different kettle of fish, with a hell of a more very expensive parts to be replaced. Sometimes the entire heating unit needs to be replaced. It could cost close to or even more than $1000. And when it comes to replacement time, theres no rebate and if the prices dont drop, it will be $3500 as compared to $800 for a 250 liter storage unit, which wont exist after next year. I chose a Rheem 325 for my house and after rebate (I got in early when the rebates were at their peak) showed a profit of $850 after the cost of the unit. 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