NSW Government Free Hot Water System Upgrade Guide

In NSW, the phrase "free hot water upgrade" usually refers to replacing an old electric storage hot water system with a modern heat pump, subsidised under the NSW Energy Savings Scheme (ESS) and federal Small-scale Technology Certificates (STCs). Whether it ends up genuinely free depends on your current setup and any site extras. Here’s the no-nonsense guide to the nsw government free hot water system upgrade: who qualifies, what’s covered, and how to avoid gotchas.

How the "free" upgrade works in NSW

The NSW Energy Savings Scheme (ESS) rewards energy savings. Accredited Certificate Providers (ACPs) arrange eligible upgrades and create Energy Savings Certificates (ESCs). Those ESCs have a market value that helps pay for your new system and installation. Federal STCs (a nationwide incentive) can also be assigned to reduce the price further.

For hot water, the most common eligible pathway is:

• Replace an existing electric resistance storage water heater with an efficient heat pump hot water system.
• An ACP coordinates the job and claims the certificates. You assign both the ESS benefits and STCs to them at installation.
• If the combined value of certificates covers all costs, your out-of-pocket can be $0; if not, you may be quoted a co-payment for extras or non-standard work.

Important boundaries:

• Gas replacements: Swapping a gas system to a heat pump is not always covered by ESS in the same way. Some ACPs may offer partial incentives or bundle other savings, but many "free" deals apply only to electric-to-heat-pump replacements. Confirm with the ACP and check the official scheme page.
• New builds generally aren’t eligible — the schemes target upgrades that cut existing energy use.
• Product eligibility is controlled by ESS rules and STC requirements. Your ACP should propose an approved model and provide its specs.

Are you eligible? Quick checks

You’re more likely to qualify for a low- or no-cost deal if the following apply:

• You live in NSW (house, townhouse or apartment).
• You currently have an electric storage hot water system (especially older, always-on cylinders).
• Your switchboard and wiring are safe and adequate for a heat pump circuit (an electrician will check).
• There’s a suitable outdoor location with decent airflow and a way to drain condensate.
• You’re willing to assign ESS benefits and STCs to the installer/ACP.

Potential speed bumps (may add cost or rule you out):

• Gas hot water or instantaneous gas without an easy electrical supply nearby.
• Complex access (roofs, cranes, long pipe runs, confined plant rooms) or strata restrictions.
• Switchboard issues (asbestos panel, no RCDs, limited capacity) requiring upgrades.
• Apartment placement where noise limits, airflow or by-laws restrict units on balconies or common areas.

Tenants can often apply, but the owner’s approval is required. Strata owners should get owners corporation consent before booking.

What a "standard" install should include (and what costs extra)

Every job differs, but a professional, scheme-backed install normally includes:

• Supply of an eligible heat pump hot water system sized for the household (installer should justify capacity).
• Removal and recycling of the old tank.
• Basic plumbing to existing hot/cold lines, new isolation valves, pressure limiting if required, and a tempering valve to deliver 50 °C to bathrooms.
• Electrical connection on an existing suitable circuit by a licensed electrician.
• Safe discharge for pressure relief and condensate drains to an approved point.
• Compliance paperwork: plumbing and electrical certificates, and forms for assigning ESS benefits and STCs.

Expect additional charges if you need:

• Switchboard or circuit upgrades, new sub-circuit, or rewiring from an off-peak (controlled load) supply that isn’t compatible with the new unit.
• Concrete slab, seismic bracing, pipe re-routing over long distances, or wall/roof penetrations.
• Strata access equipment, after-hours work, or regional travel.

Ask for an itemised written quote that clearly shows the certificate value being applied and any extras. If it’s truly free, the quote should still show $0.00 with inclusions listed.

Step-by-step: how to get the upgrade

1. Find an Accredited Certificate Provider (ACP): Search the NSW ESS register or contact reputable local installers who work with an ACP. Avoid door-knockers who won’t provide credentials.
2. Confirm eligibility: Provide photos and your address. Ask directly if your current system and site meet ESS criteria and whether any co-payment is likely.
3. Choose capacity and placement: As a rule of thumb, 160–200 L suits 2–3 people; 250–300 L suits 3–5; larger households may need 300+ litres or faster recovery. The unit should go outside with good airflow and a legal discharge point.
4. Check tariffs and wiring: If your old cylinder was on a controlled load (off-peak), confirm whether the heat pump can stay on it. Some households do better on a standard tariff with a timer, especially if you have rooftop solar. See our guide to off-peak hot water.
5. Get an itemised quote: It must list inclusions, any extras, the ACP’s details, and warranties. No vague promises like "free today, pay later for wiring".
6. Install day: A licensed plumber and electrician complete the work, commission the unit, and show you the controls. You sign the assignment of ESS benefits and STCs.
7. Collect paperwork: Keep compliance certificates, warranty information, and the product manual. Photograph the serial number.
8. Optimise settings: Set water to 60 °C (for hygiene), enable a legionella cycle if available, and schedule heat-up times to match your tariff or solar generation.

Running costs, tariffs and everyday use

A right-sized heat pump typically uses much less electricity than an old electric storage unit. To keep bills down:

• Use off-peak or solar: If you have a controlled load that suits your usage, keep it. With rooftop solar, consider a timer to heat around midday.
• Set and forget at 60 °C: Don’t run lower than 60 °C in the tank; use a tempering valve for safe delivery to taps.
• Mind the noise: Heat pumps hum like a quiet air conditioner. Place away from bedrooms and neighbours where possible and check local noise rules, especially in strata.
• Maintenance matters: Annually flush the temperature-pressure relief (TPR) valve, clear dust from air inlets, and check the condensate drain. Anodes in vitreous enamel tanks may need replacement every few years.

Considering solar hot water? It also attracts STCs, but the NSW ESS pathway most commonly supports heat pumps for the biggest, most reliable energy savings per dollar of incentive. See our heat pump vs solar hot water comparison.

Watch-outs and red flags

• Unlicensed or unaccredited operators: No ACP details, no licence numbers, or no compliance certificates offered.
• Door-knocking pressure: High-pressure sales, requests for cash deposits for a "free" deal, or refusal to give a written quote.
• Vague product info: You should be told the exact capacity and given a spec sheet (noise level, operating temperature range, refrigerant type, warranty terms).
• Hidden extras: Clarify costs for switchboard work, new circuits, long pipe runs, slabs and waste removal.
• No post-install support: You want a clear contact for warranty and service, not just a call centre.

Paperwork you should receive

• Plumbing and electrical compliance certificates (NSW).
• Warranty documents and user manual.
• Proof that ESS benefits and STCs were assigned (usually part of the installer pack you sign).

How this differs from other states

NSW’s pathway is via the Energy Savings Scheme (ESS). Victoria commonly uses the Solar Homes Program/Hot Water Rebate plus federal STCs, with different eligibility and installer rules. In all states, STCs remain the federal baseline incentive for eligible heat pump and solar hot water systems. For current details and any rule changes, check the official scheme page.

Bottom line: if you have an old electric storage unit in NSW, the ESS plus STCs can make a quality heat pump upgrade very cheap — sometimes truly free — provided your site is straightforward and you use an accredited installer.