Hot Water System Cost Guide for Yeppoon and Rockhampton Homeowners

Most people replace a hot water system once every 10–15 years. That makes it a significant purchase — and one most of us make without much background knowledge, often under pressure when the old one has already failed.

This guide covers what each type of system actually costs to buy and install here in Yeppoon and Rockhampton, what they cost to run each year, what rebates are currently available, and what the total picture looks like over ten years. The install prices below are LTH Plumbing's own pricing for the Capricorn Coast.

One note on pricing: all install prices below are for plumbing supply and installation only. Electrical work — if needed — is quoted separately by a licensed electrician. Most like-for-like replacements don't need electrical work, but heat pump installs, switchboard upgrades, or relocating the system to a new spot usually do.

Electric Storage Hot Water Systems

What It Costs to Install

Electric storage systems are the simplest and cheapest option. Installed by LTH Plumbing in Yeppoon or Rockhampton, electric storage systems cost $1,950–$2,400 — from 125L (suits 1–2 people) up to 315L (suits 4+ people), including supply and labour.

The range above depends on the unit size and any adjustments needed to your existing plumbing. As noted above, electrical work is quoted separately — most like-for-like electric replacements don't need it, but if your switchboard needs attention, budget extra for the electrician.

What It Costs to Run

This is where the numbers get important.

On a standard Ergon peak rate, an electric storage system for a typical 3–4 person household costs around $1,100–$1,400 per year to run.

On Ergon's Tariff 33 (the interruptible economy tariff Ergon uses for hot water — power is available at least 16 hours a day and Ergon controls the switch), running costs for that same household drop to around $500–$700 per year. Most homes with electric hot water should be on Tariff 33 already — if yours isn't, an electrician can arrange the change with Ergon. The ongoing saving is significant.

The 10-Year Picture

Scenario	Install	10 yrs running	10-year total
Electric (standard rate)	~$2,200	~$12,500	~$14,700
Electric (Tariff 33)	~$2,200	~$6,000	~$8,200

Running cost totals are calculated at today's Ergon rates and don't account for tariff changes over the ten-year period.

When Electric Makes Sense

• You need a same-day replacement and budget is tight
• Rental property where you want simplicity and low upfront cost
• You're already on Tariff 33 and the running cost is acceptable

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Heat Pump Hot Water Systems (Recommended)

Integrated heat pumps — where the compressor and tank live in one unit — are what I recommend to most homeowners replacing an electric system. They're efficient, reliable, and particularly well-suited to our warm Capricorn Coast climate.

What It Costs to Install

LTH Plumbing's installed pricing for integrated heat pumps on the Capricorn Coast:

• 285L Thermann R290 — from $5,200 installed
• 315L+ and split heat pump systems — quote on inspection

The "from" price above is the net amount you pay after the federal STC rebate has come off. As at April 2026, the STC rebate on a Thermann R290 heat pump is approximately $450, applied directly at point of sale — the How the Federal STC Rebate Works section further down this page covers how the rebate is calculated.

What's included in the "from" price

• Thermann R290 heat pump unit and installation
• All fittings, valves, and a new tempering valve
• Condensate run to drain (standard, under 2m)
• Removal and disposal of your existing hot water system
• STC rebate processed at point of sale (Green Bank partnership)
• QBCC Form 4 lodgement

What the "from" price assumes

• Like-for-like replacement at the existing hot water location
• Existing electrical isolator and circuit are suitable for the new unit
• Standard pipe routing under 2 metres to drain
• Ground-floor or accessible install location

Quoted separately when needed

• Electrical work (isolator, RCD, new circuit) — by a licensed electrician
• Difficult access (tight space, second storey, restricted clearance)
• Pipe re-routing or longer condensate runs
• Removal of an existing solar hot water system (panels and roof frame)
• Concrete pad construction if your install location has no existing slab and a poured concrete base is needed (rare — most sites either have an existing pad or accept a pre-fab mounting plinth)
• Relocating the system to a new spot on the property

If your install needs more than the standard scope above, I'll walk you through what's involved and what it adds before any work starts.

What It Costs to Run

A heat pump doesn't generate heat — it extracts heat from the surrounding air and transfers it to water. Because it's moving heat rather than creating it, it uses 60–70% less electricity than a standard electric element.

In our warm coastal climate, a heat pump runs at near-peak efficiency year-round. Annual running costs for a typical 3–4 person household are around $200–$350 per year (smaller households can run on less) — compared to $1,100–$1,400 on a standard-rate electric system.

One Thing to Know About Placement

The compressor unit makes noise — similar to a ducted air conditioner outdoor unit. It's not excessive, but it's something to consider when choosing where to install it. Directly outside a bedroom window isn't ideal. A side of house, carport, or garage area works well.

The 10-Year Picture

Scenario	Install cost (after STC rebate)	10 yrs running	10-year total
Integrated heat pump (285L Thermann R290)	from ~$5,200	~$2,750	~$7,950

Running cost totals are calculated at today's Ergon rates and don't account for tariff changes over the ten-year period. Install figure is the "from" price net of the ~$450 STC rebate at April 2026 — see the rebate section below for how that's calculated, and the "what's included" notes above for what the "from" price covers.

Compared to standard-rate electric at ~$14,700 over 10 years, an integrated heat pump lands at around $7,950 — saving you roughly $6,750 over the decade. Against electric on Tariff 33 (~$8,200), the heat pump 10-year total now sits a few hundred dollars below — and uses a fraction of the electricity, which matters if you have solar PV, if grid prices keep moving, or if you simply want to cut your household load. The other consideration: the STC rebate shrinks every 1 January, so installing sooner preserves more of the upfront discount than waiting.

When a Heat Pump Makes Sense

• You want significantly lower running costs without the roof requirements of solar
• Your roof isn't north-facing or has shading issues
• You're replacing an older electric system and want the best value over the long run
• This is the option I recommend most often for Capricorn Coast homeowners replacing an existing electric system

Split Heat Pumps

I also install split heat pump systems — where the compressor sits separately from the tank. These are useful for some layouts where an integrated unit won't fit or for homes that want to replace an existing solar hot water tank. Pricing for splits depends on the specific site, so I provide a quote after a short site inspection rather than a fixed price upfront.

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Solar Hot Water Systems

Solar hot water uses rooftop collectors to capture heat from the sun and transfer it to a storage tank. An electric booster handles cloudy days and high-demand periods.

What It Costs

Solar hot water pricing depends heavily on the specific system (flat plate vs evacuated tube), tank size, number of collectors, roof complexity, and whether new pipework is needed between the roof and tank. For these reasons I quote solar hot water after a site inspection rather than publishing a fixed range.

The federal STC rebate applies to eligible solar hot water installs and is applied at point of sale. The exact STC count depends on the specific model and climate zone.

What It Costs to Run

In our climate — averaging over 300 days of sunshine per year — a properly installed solar hot water system meets 70–80% of your hot water needs from solar, with the electric booster covering the rest. Annual running costs are typically $100–$300 per year.

That's the lowest annual running cost of any system type.

Requirements

Solar hot water requires a north-facing (or close to it) roof section with enough unshaded space for the collectors. A tree that shades your roof for several hours a day will materially reduce performance. If you have a suitable roof, Yeppoon's climate is one of the best in Queensland for solar hot water performance.

Solar systems also have more components than electric or heat pump — the collectors, heat exchanger, and booster all need periodic attention. Annual servicing is worthwhile and extends the system's lifespan to 15–20 years.

When Solar Makes Sense

• You have a north-facing roof with sufficient unshaded space
• You're planning to stay in the property for 10+ years
• You want the absolute lowest long-term running cost

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How the Federal STC Rebate Works

The federal Small-scale Technology Certificate (STC) scheme is the main rebate available for heat pump and solar hot water installations in Australia. Here's what you actually need to know.

What an STC is, in plain English

An STC is a tradable certificate issued by the federal government when you install an eligible clean-energy system — a heat pump counts because it uses much less grid electricity than a standard electric element to heat the same water. Each STC represents one megawatt-hour (MWh) of electricity the system is expected to displace over its lifetime. Those certificates have a dollar value on the open market (close to the legislated cap of $40 each at the time of writing), and that value becomes your rebate.

The phase-out is the urgency

The STC scheme is being wound down. Heat pumps installed in 2026 get 5 years of deemed generation counted toward the rebate — down from 6 years in 2025. That number drops by one more year every 1 January. Installs from 2031 onward earn zero STCs — at that point the rebate is effectively gone.

Install year	Years of deeming	Approx. rebate vs 2025
2025	6	—
2026	5	~17% less
2027	4	~33% less
2028	3	~50% less
2029	2	~67% less
2030	1	~83% less
2031	0	No STC rebate

What this means for you: the same heat pump installed this year earns a meaningfully bigger rebate than the same system installed next year. If you're planning to replace your hot water soon, acting sooner gets you more of the rebate before it shrinks.

How the discount shows up on your quote

You don't claim the rebate yourself. At the install, you sign a one-page STC assignment form — this transfers the certificates from you to my STC processing partner. The rebate amount comes straight off the quoted price. No paperwork after the fact, no waiting for a cheque.

Why I don't quote a fixed rebate dollar on this page

The exact number of STCs a heat pump earns depends on the specific model (bigger/more efficient systems earn more), your installation postcode, and the year. The STC market price also moves slightly each day. Rather than publish a figure that could be wrong for your situation, I'll calculate the accurate rebate into your quote.

If you want a definitive figure before calling me, you can run your shortlisted heat pump model through the official Clean Energy Regulator STC calculator — it handles the maths and your postcode zone automatically.

Solar hot water

Solar hot water also generates STCs using the same framework — same phase-out schedule, same point-of-sale process. The exact count varies by model and roof setup, and I quote it into the total after a site inspection.

The Queensland state rebate you may have seen

The Queensland Climate Smart Energy Savers program — which you may see referenced in older articles online — closed to new applications in December 2023 and is no longer available. If another Queensland-specific rebate is introduced, I'll update this page.

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How to Choose the Right System for Your Home

The numbers above give you the framework. Here are the questions that turn the framework into a clear answer for your situation:

How long are you staying in the home? If it's 3 years, the upfront cost matters more. If it's 10+, the long-run economics strongly favour a heat pump.

What tariff are you on? Tariff 33 is significantly cheaper than standard rate for running electric hot water. If your system is on the standard rate, you may be spending $500–$700 a year more than you need to.

Does your roof suit solar? North-facing, unshaded, enough space. If yes, solar is worth a conversation. If not, heat pump achieves most of the same long-term savings without the roof dependency.

What's your upfront budget? After the STC rebate, the gap between electric storage and an integrated heat pump starts from around $2,800–$3,250 depending on electric tank size (heat pump from $5,200 net vs electric storage $1,950–$2,400 installed). Over 10 years, the running cost difference works firmly in the heat pump's favour — around $6,750 saved against standard-rate electric.

Is this a rental? Running costs fall on the tenant; upfront cost falls on you. This changes the calculus — electric storage is often the practical choice for investment properties.

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Frequently Asked Questions

How quickly does a heat pump pay for itself in Yeppoon? Based on the running cost difference against a standard-rate electric system, most heat pump installations on the Capricorn Coast pay back the upfront premium in 3–5 years. Everything after that is pure saving.

What rebates can I actually claim right now? The federal STC scheme is the main one — applied at point of sale by your installer, no forms or paperwork for you. The exact amount depends on your heat pump model and install year (the scheme phases out to 2031). The section above titled How the Federal STC Rebate Works covers the detail. The Queensland Climate Smart state rebate closed in December 2023 and is not currently accepting applications.

Does the hot water system brand make a big difference? For heat pumps, yes — reliability and efficiency (COP rating) vary between brands. For electric storage, less so. I install brands I've seen perform reliably over years in this climate. I won't put a system in that I'd have to come back and service repeatedly.

What size do I need? Ergon publishes a sizing guide for Tariff 33 eligibility. As a rough starting point:

Household	Electric storage	Heat pump	Solar hot water
1–3 people	125 L	270 L	160 L
3–5 people	160 L	270 L	300 L
4–6 people	250 L	270 L	440 L
6–8 people	315 L	340 L	440 L

Source: Ergon Energy — Hot Water Tank Sizes. I'll size the actual system based on your household usage and any specific requirements (bath use, dishwasher, etc.).

My system just failed — do I have to decide today? If you need hot water urgently, I can install a temporary electric replacement same day while you decide on the final system, or I can give you a quote across the options on the spot so you can decide with full information.

Do you install solar hot water and split heat pumps? Yes to both — I quote solar and split systems after a short site inspection because the right setup depends on your roof, layout, and existing plumbing.

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Want a quote for your home in Yeppoon or Rockhampton? LTH Plumbing supplies and installs electric, heat pump, and solar hot water systems across the Capricorn Coast. Call 0455 869 383 or get a free quote — I'll give you a recommendation based on your actual home rather than a list of options.