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Hi, We are looking at replacing our old hot water cylinder and the plumber has suggested mains pressure be the way to go as we have just put a toilet and shower out in in our garage and then the hot supply will reach out there..He has just suggested the pump thing you are talking about..obviously the split one as he talked of the box been connected outside..he mentioned that there are only certain mains pressure cylinders that are compatible with this..do you know the ones that are not?we are looking at a 250 litre mains pressure hot water cylinder..we have 2 adults and 2 teenagers in the house and currently have a 180 litre double element lightning series dated 1991 year of manufacture..The plumber mentioned that provided we chose the compatiable cylinder we could at a later date hook up the pump..although the price he said to us to purchase it would be around $1000 which is way less than the prices on your chart and im assuming they dont include instalation..so maybe he has the incorrect price..either way i would really appreciate you advice on what the best way to go is and if you could please tell us the cylinders that arent compatiable..our gap is only 560width and the rheem cylinders for the 250 litre are like 580width so wont fit.. thanks heaps
We are just building a new home and were going to go for gas hot water so it was instant and constant when required. Should we be going with the new daikin type hot water heat pumps.
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Is there going to be an update / new test of these? You mentioned CO2 based units which look like they've been around for a while now.
Also, what are the reheat times if you were to use all of the hot water? We occasionally completely empty our hot water tank (180 litre I think) and with growing kids this is likely to happen more often and we would prefer not to buy a new cylinder as the current one is pretty new.
I assume that the econergy unit price mentioned ($4300) does not include the water tank, unlike the intergrated models. Are you able to clarify?
Can you have a mains pressure hotwater cylinder heated by a heatpump and have the cylinder also connected to a wetback woodburner?
if you choose to use HWHP for hot water, a heat pump for an indoor lap pool and a heat pump to heat a house can any of these be connected?
Just wondering if anyone has any info or experience of the Aquafire systems www.aquafire.co.nz, particularly in the south (we are in Wanaka, Central Otago)
I wonder if any of the units you tested are suitable for heating a pool. If the econergy heats water to a fixed temperature of 60C it is clearly not suitable. How about the others?
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You write "A good heat-pump water heater (HPWH) would reduce your hot-water bill by two-thirds" .
I assume this is compared to other electric water heating.
What is the running cost compared to gas?
Annual running cost of HPWH is cheaper according to the Energywise website, check the "ongoing running costs" Graph:http://www.energywise.govt.nz/how-to-be-energy-efficient/your-house/hot-water/choosing-the-right-water-heating-system
most comparisons of Electric/Gas/HWHP don't take into count the gas connection line charge $1 per day in auckland 0.70c Hamilton eliminating gas connection from the house can save $365 per yearcontrolled rate electric is often best for low hot water users HPHW is best for high users of hot water
Because gas water heating units are only around 85% to 90 % efficient, plus the supply charge, I don't understand why people go for this option.