Hot Water Solutions — Heat Pumps, Cylinders & Continuous Flow | Blenheim

Hot water is a daily essential, and the system that provides it has a significant impact on your household energy bills. In Marlborough, with its exceptional sunshine and mild winters, heat pump water heating technology is particularly cost-effective — making it one of the best home efficiency investments available to local homeowners. At Marlborough Plumbing & Heating, we're Stiebel Eltron Accredited Installers, which means we've been trained and assessed to install and warrant their industry-leading heat pump hot water systems.

Whether you need an urgent cylinder replacement, want to upgrade to a heat pump system to cut your power bills, or you're specifying a hot water system for a new build, we can help. We carry and install products from leading brands including Stiebel Eltron, Rheem, and Rinnai, and we'll give you honest advice on the system that best suits your home, household size, and budget.

Heat Pump Water Heaters

Heat pump water heaters work by extracting heat from the surrounding air and using it to heat water — the same principle as a heat pump air conditioner, but in reverse. They're typically three to four times more efficient than electric resistance heating, meaning they can cut your hot water energy costs by 60–70% compared to a standard electric cylinder. In Marlborough, with warm summers and mild shoulder seasons, heat pump technology performs well for much of the year.

We install heat pump water heaters in garages, utility rooms, and exterior installations where there's adequate airflow. Stiebel Eltron's WWK series is among the most efficient units available in New Zealand, and as accredited installers, we can provide full manufacturer warranty support. We'll assess your installation location, hot water demand, and existing electrical supply to recommend the right unit for your home.

Electric Hot Water Cylinders

Standard mains-pressure electric cylinders remain a reliable and straightforward hot water solution. If your existing cylinder has failed or reached the end of its service life (typically 15–20 years), a like-for-like replacement is often the most practical option. We keep common cylinder sizes in stock for fast turnaround — in many cases, we can replace a failed cylinder the same day or the next business day. We install cylinders from Rheem and other leading NZ suppliers, and we'll ensure your new unit complies with current Plumbing and Drainage Regulations.

Continuous Flow (Gas & Heat Pump)

Continuous flow — or instantaneous — hot water systems heat water on demand rather than storing it in a cylinder. They're popular in homes where space is limited, where hot water demand is high, or where the previous owner installed gas infrastructure. We install continuous flow units from Rinnai and Rheem, both well-regarded brands with strong New Zealand service networks. If you're in an area with natural gas or LPG supply (available in parts of Blenheim), continuous flow can be an excellent option. We can also discuss heat pump continuous flow technology for all-electric solutions.

Solar Hot Water

Marlborough is New Zealand's sunniest region, averaging over 2,400 sunshine hours per year — consistently the highest in the country. This makes solar hot water technology more cost-effective here than almost anywhere else in New Zealand. Solar thermal collectors on your roof pre-heat water that then enters your cylinder or buffer tank, dramatically reducing the energy your system needs to reach temperature. We can discuss solar options as part of a complete hot water system design, particularly for new builds and significant renovations.

Hot Water for Commercial Properties

Commercial hot water demands — for accommodation, hospitality, healthcare, or industrial facilities — require different thinking from residential installations. High hot water demand, continuous availability, Legionella prevention, and compliance with Health and Safety regulations all need to be considered. We've designed and installed commercial hot water systems across Marlborough, including for wineries, accommodation providers, and commercial facilities. Contact us to discuss your commercial requirements.