Browse our complete range of hot water systems available for purchase online with fully installed pricing. O'Brien Plumbing & Roofing supplies and installs heat pumps, electric storage, gas continuous flow, and gas storage systems from leading Australian and international brands. Every installation includes removal of your old system, all plumbing and electrical connections, compliance certificates, and our lifetime labour guarantee on workmanship.
We service the entire Central Coast and Northern Sydney with same-day and next-day installation available for most standard replacements. Our licensed plumbers carry common systems on their vehicles for emergency hot water replacements.
Heat pump hot water systems extract heat from the surrounding air to heat water, using approximately 65–75% less electricity than a traditional electric storage system. They are eligible for significant government rebates under the NSW Energy Savings Scheme and federal Small-scale Technology Certificates (STCs). A typical 4-person household can save $300–$500 per year on hot water heating costs by switching from electric storage to a heat pump.
We supply and install heat pumps from Reclaim, Sanden, iStore, Rheem Ambiheat, Stiebel Eltron, and Emerald. Installation includes connection to existing plumbing, electrical supply, condensate drainage, and programming of boost timers for off-peak operation.
Electric storage systems remain the most common hot water type in Australian homes. They are reliable, affordable to purchase, and available in off-peak (controlled load) and continuous tariff configurations. Off-peak systems heat water overnight using cheaper electricity rates, while continuous systems maintain temperature throughout the day.
We supply electric storage systems from Rheem, Dux, Aquamax, Vulcan, and Rinnai in sizes from 25L (under-sink) to 400L (large family). Replacement of a like-for-like electric storage system is typically completed within 2–3 hours.
Gas continuous flow systems heat water on demand as it passes through the unit, providing unlimited hot water without a storage tank. They are compact, wall-mounted, and highly energy efficient with 5–6 star energy ratings. Ideal for households with variable hot water demand or limited space for a storage tank.
We supply and install continuous flow systems from Rinnai, Rheem, Bosch, and Thermann. Available in natural gas and LPG configurations with flow rates from 16L/min (1 bathroom) to 32L/min (3+ bathrooms). Multiple units can be manifolded together for commercial applications.
Gas storage systems combine the fast recovery of gas heating with the convenience of stored hot water. They recover 2–3 times faster than electric storage, making them suitable for larger households with high simultaneous demand. Available in 135L to 360L capacities in both natural gas and LPG.
We supply gas storage systems from Rheem, Rinnai, and Dux. Installation includes gas line connection, flue installation (for internal units), and tempering valve where required by AS/NZS 3500.
NSW residents replacing an electric storage hot water system with an eligible heat pump may receive:
We handle all rebate paperwork and apply the discount directly to your invoice — no waiting for reimbursement.
We install hot water systems across the entire Central Coast (Wyong, Gosford, Terrigal, Erina, Tuggerah, The Entrance, Bateau Bay, Woy Woy, Umina Beach, Kincumber, Avoca Beach, Toukley, Budgewoi, and all surrounding suburbs) and Northern Sydney (Hornsby, Waitara, Asquith, Normanhurst, Thornleigh, Pennant Hills, Wahroonga, Berowra, Mt Colah, and surrounding suburbs).
Central Coast: (02) 4351 3665 | Northern Sydney: (02) 9477 1519
Same-day installation available for emergency replacements. Standard installations typically scheduled within 1–2 business days.
For a typical 4-person household, we recommend either a 250–315L heat pump (most energy efficient, eligible for rebates) or a 26L/min gas continuous flow system (unlimited hot water, compact). The best choice depends on your energy source, roof space, and budget. Our technicians provide a free system recommendation during the installation quote.
Installed prices range from $1,800–$2,500 for electric storage, $2,200–$3,500 for gas continuous flow, and $3,500–$5,500 for heat pumps (before rebates). Heat pump rebates typically reduce the final cost by $800–$1,200.
A like-for-like replacement (same fuel type, same location) typically takes 2–3 hours. Conversions (e.g., electric to heat pump, or relocating the unit) may take 4–6 hours depending on the plumbing and electrical modifications required.
Yes. Every installation includes disconnection and removal of your old system, disposal at an approved recycling facility, and a compliance certificate for the new installation.