Choosing the Right Hot Water Cylinder for Coastal and Harsh Environments

6 August 2025

New Zealand has one of the most beautiful coastlines in the world, and many of us are lucky to live in cities, towns, and communities within walking distance of the beach. While this makes our country a fantastic place to live, it can come at a cost to our infrastructure and appliances. Salt-laden air, high humidity, and mineral-rich water (which we also have a fair bit of in NZ) can accelerate corrosion and reduce the lifespan of outdoor products. In this regard, hot water systems are no exception. Choosing the right hot water heater for the conditions is essential to ensuring durability, efficiency, and long-term performance.

Built for Tough Conditions 

To mitigate corrosion, it's crucial to select appropriate materials for the environment and ensure proper design and installation. Rheem cylinders are designed and manufactured right here in New Zealand, and several of our models are specifically engineered to perform in demanding environments. From coastal homes to regions with harsh water conditions, we’ve developed a range of systems built to last.

They also look great too. Encased in a sleek colourbond jacket or a painted sheet metal design, Rheem units come in neutral colours to go with all types of exterior cladding and landscaping.

Heat Pump Water Heaters
Rheem’s outdoor heat pump water heaters feature robust external coatings that shield against corrosion. These coatings maintain their sleek finish while protecting the internal components, making them an ideal option for seaside homes or exposed installations. The Rheem AmbiPower 280e Heat Pump is a great example: not only is it built for outdoor durability, but it also delivers excellent energy savings and a reduced carbon footprint.

Stainless Steel Water Heaters
Rheem’s stainless steel hot water cylinders are another reliable choice for coastal installations. Stainless steel naturally resists rust and corrosion, offering durability in harsh environments. These cylinders are a lightweight stainless steel, yet sturdy, which simplifies installation and supports long-term performance. There are both indoor and outdoor options available, with the outdoor Stainless Steel models encased in a colourbond jacket for extra protection against the elements.

VE Water Heaters
In areas with hard or aggressive water, the Rheem range of Vitreous Enamel (VE) and Optima VE cylinders provide excellent corrosion resistance. The enamel lining prevents a wide range of water conditions from damaging the inner steel tank, extending the system’s lifespan and reducing maintenance over time. These models are a smart choice for inland areas with challenging water chemistry.

Find the Right Cylinder for Your Site

Whether you’re specifying a system for a coastal home or navigating inland water quality issues, consider:

  • Exposure to sea air or high humidity
  • Water mineral content and chemistry
  • Indoor or outdoor installation
  • Maintenance expectations

Once you have identified the conditions in your area, you can choose the model that best fits your property, whether it be a Rheem heat pump, stainless steel, or a VE water heater model. If you’re still unsure as to which water heater is right for your home, one of our team members would be happy to help. Fill out an enquiry form or give us a call on 0800 657 336.

Coastal and Harsh Environment Solutions 1

Optima Mains Pressure VE

Coastal and Harsh Environment Solutions 2

AmbiPower 280e Heat Pump Water Heater

Coastal and Harsh Environment Solutions 3

Optima Mains Pressure VE