澳洲Australia property Rainwater and electricity? | Sydney


在澳大利亚 I need some advice regarding a property purchase. Property - semi-detached house Bedrooms - 2 Condition - average needs internal reno to modernise Street - one of the best in suburb Location - excellent Close to schools - yes Transport - 50m The pool at of an IP needs to be resurfaced (or so the pool doctor says), the cost was estimated to be $10K ($10,000), after recoverying from my impresssion of a cat coughing up a fur ball, it just seems far too much. Its just a standard poo


I am a bit lazy and could probably work it out myself but was wanting your opinions/experiences. Just had rainwater tanks installed on my current duplex to comply with BASIX water saving requirements. Started watering the ground with the rainwater tap in preparation for my turfing and noticed that the pump had to constantly run to maintain the pressure. I thought it was a bit pointless on one hand saving on water and on the other paying for electricity to pump the stuff onto my yard!

So what costs me more in this situation - water or power??? :)  

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Power.

Water is as cheap as ... water!

(Can't work out the numbers without knowing the pump rating, etc)  

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Yes, it's not a great system.

I've worked on a similar industrial system and what I did was to install a flow switch in the line and the pumps only cut in if there was a flow.
However, you might have a problem if you have no pressure head at all.

Would it at all be possible to switch the pump on before each use, or is it used too frequently?

Edit: I re-read your post. Do you mean that the pump is running 24/7 (which I assumed) or that it's running constantly while using the water? If it's the later, don't worry about it too much.  

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There is something wrong if the pump is running all the time. It could be as simple as leaks. Most likely toilets and washing machine also connected. So one of those might be using the water at that time too.  

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Probably a bit late for Rockstar, but in the 'olden days' we'd put rainwater tanks on a tankstand and the water was gravity fed to the taps (no pumps req'd).  

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The tank stand is on the top of the hill Prop. It's called town water. :D

My system is charged on flat ground so there is no head at all which requires the water to be pumped to get the pressure. It does not run at all when water is not being used but runs constantly when my outdoor rainwater garden tap is turned on to run my sprinkler. So my question was would the power bill be more costly than the town water bill in this situation.

Let me know if these calcs sound right?

Pump is a Davey HP45-05 - 0.77kW - 26c per kWh = 20c/hr

Town Water charge is $1.80 per kL Need to check flow rate but think it would be around 20L per min at full bore - which is 1200L per hr = $2.16/hr  

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Leave the tap open then and put a timer on the pump.
How are the sprinklers controlled now? Just make whatever controls them now, control the pump instead. This is assuming that only the pump is on it.  

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spludgey said: ↑
How are the sprinklers controlled now?Click to expand...
It's just one garden sprinkler hooked up to the tap which I manually turn on. A requirement of BASIX was to hook up the rainwater to toilet, laundry and one outdoor garden tap. When I turn on the outdoor tap the pump pressurises the rainwater and runs constantly till I turn the tap off.  

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I'm not sure this is any help at all Rockstar, however we have rainwater gravity fed into laundry, (no pump needed). Good pressure.

Rainwater (again, gravity) into kitchen, no pump. Good pressure.

Other rainwater tanks feed into a 'storage' tank which has a little pump, was $300 or maybe tops, $350 which cuts in and out as water used in house, (ie bathroom), it's quiet, electric and only uses power if we are in bathroom, eg toilet, sink, bath, shower..(outside toilet is hooked up to laundry rainwater). It gives us no grief, goes like clappers, it is covered over to protect from weather and is terrific pressure.

Power bills are fine, only time they go through roof is when people exceed 4 adults, 3 x children. And that is only in summer with the 47c and we go for all the airconditioning, so not water pump related.

I don't think that is any help for your costings tho'.

Nevermind.:p  

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Is a davey.  

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Sounds like you already have it constructed and plumbed so might be a little late to make changes.
The most efficient setup is to have a small header tank about ~3m up. 500L - 1000l. Pump fills this then shuts off. Since you can plumb it in a pipe diameter suitable for higher flow the pump needs to run less to shift same amount of water.
Gravity feed to toilets etc. Works fine with subsurface drip irrigation. Sprinklers generally require higher pressure.  

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Rockstar said: ↑
When I turn on the outdoor tap the pump pressurises the rainwater and runs constantly till I turn the tap off.Click to expand...
That's how the pump is designed to work. I'm not sure what you are complaining about :)

Based on a study I read, it is not really worth (financially) to install a rainwater tank. Running cost (power) is very minimal.
Also remember, your plants would love the chemical free water!  

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Not complaining Devank just getting my head around the efficiency of using rainwater in a situation like this. :)
Most of the new houses built in NSW now would be in the same situation - rainwater tank sitting on flat ground next to their house with a pressure pump set up. Pump has an attached sensor that will automatically switch over to town water supply when water in tank falls below critical level.

our obsession said: ↑
I'm not sure this is any help at all Rockstar,

Nevermind.:pClick to expand...
OO, it is of no help at all though I am always grateful to people like yourself who are trying to help. ;):)  

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Doovalacky said: ↑
Sounds like you already have it constructed and plumbed so might be a little late to make changes.
The most efficient setup is to have a small header tank about ~3m up. 500L - 1000l. Pump fills this then shuts off. Since you can plumb it in a pipe diameter suitable for higher flow the pump needs to run less to shift same amount of water.
Gravity feed to toilets etc. Works fine with subsurface drip irrigation. Sprinklers generally require higher pressure.Click to expand...
That seems a great idea. If there is room for another tank..

Rockstar, how about solar power?  

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vbplease said: ↑
That seems a great idea. If there is room for another tank..

Rockstar, how about solar power?Click to expand...
This is all in a duplex development situation so all a bit overcapitalising for the project but agree with the good ideas. I wonder what the council planners would feel about a 3m high tank stand in suburbia for all the neighbours to see? :)  

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Well come across header tanks inside the roof quite a number of times in older houses. :D
Generally decommissioned since they have rusted out and mains water pressure is higher now.  

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dunno about 10foot high tankstands, our header tank, as a child, sat directly oin top of the rain tank, was filled by a windmill pump (no neighbours) only about 4-5 feet higher than water level, but it had a 1inch line so had a large flow, even at small pressures (~2psi=5feet) and filled the washer and toilets very well  

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