Got your latest electricity bill yet? If you haven’t, brace yourself. If you have, you probably need a stiff drink.
We’re seeing rates in NSW climb over 35c to 40c per kWh in some peak periods. That hurts. And when you look at where that money is going, the answer is usually sitting right in your backyard or on your roof.
Here’s the cold hard truth. Heating and cooling your home (HVAC) plus heating your water accounts for about 60% to 70% of your total energy bill. Most people treat these as two separate problems. You’ve got the air con guy, and you’ve got the plumber.
But technology has changed. The smartest way to drop that bill isn’t just turning the lights off. It is looking at combined systems, specifically Air-to-Water Heat Pumps (hydronics), or simply getting your existing systems to talk to your solar.
Let’s break down how this works without the boring engineering lecture.
The Old Way vs. The Smart Way
Traditionally, you might have a gas instant hot water system and a ducted reverse cycle air con. They do their own thing. They don’t talk to each other. They both chew through energy whenever they feel like it.
The “Combined” Solution (Hydronics)
This is the gold standard we’re installing a lot more of lately.
An Air-to-Water Heat Pump is one unit that sits outside. It looks like a standard air con compressor, just a bit chunkier.
- It heats water for your shower and kitchen.
- It also produces hot water that runs through radiator panels or underfloor heating to warm your house.
- Some units can even reverse cycle to provide cooling.
Why is this better?
Efficiency. A standard electric hot water tank is 100% efficient. That means 1kW of power equals 1kW of heat. A gas system is about 80% to 90% efficient.
A modern heat pump? It’s often 400% to 500% efficient.
That means for every 1kW of electricity you pay for, you get 4kW to 5kW of heat energy. You are literally pulling free heat out of the air, even on a chilly Newcastle morning, and pumping it into your home.
Using “Thermal Batteries” (It’s not as fancy as it sounds)
If you aren’t ready to rip out your entire system for a hydronic setup, you can still manage your usage better by changing how you think about “storage.”
Your hot water tank is a battery. It stores heat energy.
Your concrete slab or insulated home is a battery. It stores cool or warm air.
If you have solar panels, the game is simple. Run everything between 10 am and 2 pm.
We set up “solar diversion” systems or simple timers. Instead of heating your water at 2 am using expensive grid power, your system kicks in at 11 am when your solar is peaking. It heats the water to 70°C. You are essentially storing that free solar energy to use for your shower at 7 pm.
Same with the HVAC. Don’t wait until you get home at 5:30 pm to blast the heat. If you have a smart controller, trickle heat through the house during the day using solar.
But Is It Worth the Cost?
Let’s be honest. Installing a combined Air-to-Water system or upgrading to high-efficiency heat pumps isn’t cheap upfront. You’re looking at a bigger investment than swapping out a like-for-like gas heater.
But let’s look at the maths (based on current NSW averages).
| System Type | Approx. Daily Cost (Hot Water) | Annual Running Cost |
| Old Electric Tank | $3.50 – $4.00 | ~$1,300+ |
| LPG Gas Instant | $2.50 – $3.00 | ~$1,000+ |
| Heat Pump (on grid) | $0.80 – $1.00 | ~$300 |
| Heat Pump (with solar) | $0.00 – $0.15 | ~$50 |
Figures are estimates based on average usage.
If you combine this savings with your heating and cooling costs, the payback period on these systems is dropping fast. Often within 3 to 5 years. After that, it’s just money in your pocket.
What About the Noise?
Ten years ago, heat pumps sounded like a jet engine taking off in your backyard. Neighbours hated them. The new gear from brands like Rheem, Istore and Envirosun are quiet as a whisper. You often need to walk right up to them to check if they’re actually running.
So, What’s The Next Step?
Don’t just wait for your hot water system to blow up and flood the garage. That forces you to panic-buy whatever is in stock, which is usually an energy guzzler.
Start planning now.
If your air conditioner is aging or your hot water system is rusting out, give us a bell. We can come out, look at your roof, check your solar situation, and give you a straightforward option that stops the power company from raiding your bank account every quarter.
Give us a call on 0488 029 618 or grab a quote online. We’re local, we turn up on time, and we don’t do the hard sell.