Introduction
As a homeowner in New Zealand, there's nothing quite like the disappointment of stepping into a cold shower to start your day. If you're experiencing this on a regular basis, it may be a sign that your hot water cylinder (HWC) is on its way out. Other indicators that your HWC needs replacing include its age (most cylinders have a lifespan of 15-20 years), rust, leaks, or a general decrease in performance. Rather than waiting for your HWC to fail completely, it's a good idea to plan ahead and consider replacing it before it becomes an emergency. Not only will this save you from the inconvenience of cold showers, but it will also give you the opportunity to explore more efficient and cost-effective options. In this article, we'll take a closer look at the different types of hot water cylinders available in New Zealand, their costs, and what you can expect from the replacement process.
Types of Hot Water Cylinders
When it comes to choosing a new hot water cylinder, there are several options to consider. The most common type is the electric storage cylinder, which is available in a range of sizes from 180-300 litres. These cylinders are relatively affordable, with a supply cost of $1,200-$2,500. However, they can be less efficient than other options and may not be the best choice for larger households.
Another option is the heat pump hot water cylinder, which is 2-3 times more efficient than traditional electric cylinders. Brands such as Sanden, Rheem, and Bosch offer heat pump hot water cylinders, with a supply cost of $2,500-$5,000 and an installation cost of $500-$1,000. These cylinders are a great choice for households looking to reduce their energy consumption and lower their power bills.
Gas continuous flow hot water cylinders are another option, with no tank required and a supply cost of $1,000-$2,500. These cylinders are ideal for households with a high demand for hot water, as they can provide a continuous flow of hot water without the need for a storage tank.
Finally, there's the solar thermal hot water cylinder, which uses solar energy to heat the water and includes an electric boost for cloudy days. These cylinders are the most expensive option, with a total installed cost of $5,000-$10,000. However, they offer a highly efficient and environmentally friendly way to heat your water.
Here's a comparison table to help you decide which type of hot water cylinder is best for your household:
| Type | Upfront Cost | Running Cost | Suitability |
|---|---|---|---|
| Electric Storage | $1,200-$2,500 | Medium | Small-medium households |
| Heat Pump | $2,500-$5,000 | Low | Medium-large households |
| Gas Continuous Flow | $1,000-$2,500 | Medium | Large households |
| Solar Thermal | $5,000-$10,000 | Low | Environmentally conscious households |
Sizing Guide
When choosing a new hot water cylinder, it's essential to consider the size of your household and your hot water usage. A general rule of thumb is to allow 45-60 litres of hot water per person. For example, a family of four would require a cylinder with a capacity of at least 180-240 litres. You should also consider your peak draw-off, which is the amount of hot water required at any one time. For example, if you have a large household with multiple showers and a bath, you'll need a cylinder with a higher peak draw-off.
It's also important to note the difference between off-peak and anytime tariff cylinders. Off-peak cylinders are designed to heat water during off-peak hours (usually at night) and store it for use during the day. Anytime tariff cylinders, on the other hand, can heat water at any time. If you're on an off-peak tariff, you'll need to choose a cylinder that's specifically designed for this purpose.
Cost of Replacement
The cost of replacing a hot water cylinder can vary depending on the type and size of the cylinder, as well as the cost of labour and any additional components required. Here's a breakdown of the typical costs involved:
- Supply cost: $1,200-$2,500 (electric storage), $2,500-$5,000 (heat pump), $1,000-$2,500 (gas continuous flow)
- Labour cost: $350-$650 (plumber)
- Draincock: $50-$100
- Pressure limiting valve: $50-$100
- Thermostat expansion valve: $50-$100
- Disposal of old unit: $100-$200
Total typical cost: $2,000-$4,000 (standard electric)
Heat Pump Hot Water — Is It Worth It?
Heat pump hot water cylinders are a highly efficient and cost-effective option for households looking to reduce their energy consumption. With the help of the EECA Warmer Kiwi Homes subsidy, eligible households can receive up to $2,500 towards the cost of a heat pump hot water cylinder. Additionally, heat pump hot water cylinders can save households $600-$1,200 per year on their power bills, making them a worthwhile investment. The payback period for a heat pump hot water cylinder is typically 5-10 years, depending on the cost of the cylinder and the amount of hot water used.
To manage your finances and track your expenses, consider using accounting software like Xero or job management tools like Fergus or Tradify. These tools can help you stay on top of your finances and make informed decisions about your business or household.
Off-Peek Tariff
Off-peak tariffs are a great way to save money on your power bills, especially if you have a hot water cylinder. In New Zealand, off-peak tariffs are offered by several retailers, including Contact Energy and Mercury Energy. These tariffs allow you to heat your water during off-peak hours (usually at night) and store it for use during the day. When choosing a hot water cylinder, it's essential to consider whether you're on an off-peak tariff and choose a cylinder that's specifically designed for this purpose.
Do You Need a Licensed Plumber?
Yes, you do need a licensed plumber to replace your hot water cylinder. In New Zealand, cylinder replacement is considered restricted plumbing work and requires a PGDB (Plumbing, Gasfitting, and Drainlaying Board) licence. A licensed plumber will ensure that the job is done correctly and safely, and will provide you with a Certificate of Compliance. For more information on what plumbing work you can do yourself, check out our article on DIY plumbing in NZ.
How to Choose an Installer
When choosing an installer to replace your hot water cylinder, it's essential to do your research and choose a reputable and qualified plumber. Here are some tips to help you choose the right installer:
- Make sure the plumber is PGDB registered
- Get at least three quotes from different plumbers
- Ask about the cylinder brand warranty (e.g. Rheem 10-year warranty, Rinnai 5-year warranty)
FAQ
Here are some frequently asked questions about hot water cylinder replacement:
- Q: How long does an HWC last in NZ? A: The lifespan of a hot water cylinder in New Zealand is typically 15-20 years.
- Q: Can I replace my HWC myself? A: No, hot water cylinder replacement is considered restricted plumbing work and requires a PGDB licence.
- Q: What size hot water cylinder do I need for a family of four? A: A family of four would require a cylinder with a capacity of at least 180-240 litres.
- Q: Is a heat pump hot water cylinder worth it? A: Yes, heat pump hot water cylinders are a highly efficient and cost-effective option, with potential savings of $600-$1,200 per year on power bills.
- Q: Can I use a heat pump hot water cylinder with an off-peak tariff? A: Yes, heat pump hot water cylinders can be used with an off-peak tariff, but you'll need to choose a cylinder that's specifically designed for this purpose.
Conclusion
Replacing your hot water cylinder can seem like a daunting task, but with the right information and planning, it can be a straightforward and cost-effective process. By considering your options and choosing the right type of cylinder for your household, you can save money on your power bills and enjoy a reliable and efficient hot water system. To find a qualified and reputable plumber to replace your hot water cylinder, check out our directory of PGDB plumbers. You can also use our hot water cylinder calculator to determine the best size and type of cylinder for your household. Visit tradietools.nz today to learn more and get started on your hot water cylinder replacement project.