Gas Hot Water Heater Support

Gas hot water heaters are a familiar fixture in a lot of homes. They use convection, a law in physics which describes how heat rises, to heat the water. Gas water heaters burn either natural gas or LPG to heat the water supplied to the outlets. 

If you are looking to install or repair a gas hot water system, get in touch with our plumbing experts and we will endeavour to address your biggest questions and concerns. 

There are certain advantages to using gas to heat your water over using electricity.

gas water heater auckland

Quick Recovery & Heating Gas hot water system work twice as fast to heat your water than electric hot water cylinders, they also recover much faster than electric models, meaning your hot water supply is replenished faster.

A gas water heater can heat 190L of water in roughly an hour, while an electric model may take several hours longer. If you have a large household or your household has high hot water usage, then a gas hot water heater is by far a better option than an electric heater.

Low Energy Cost Gas water heaters also have lower energy costs when compared with electric models. While gas models suffer heat loss from exhaust gases and the walls of the tanks; electric models are far more energy efficient.

However, in terms of energy costs, gas heaters are far more affordable to operate since natural gas and LPG are far less expensive than electricity. Gas heaters cost more upfront to install, but they make up the difference in operation costs.

Easy to retro-fit into your existing cylinder installation These systems are also easy to install, especially if you already use reticulated gas in your home. 

There are two main systems for heating water in your home:

  • Gas hot water cylinder system.
  • Gas continuous flow system.

How Much Does It Cost To Install a Gas Hot Water Heater?

The price to install a gas hot water heater depends on the type heater you choose, the unit’s size, installation complexity and the property’s location.

In New Zealand, the typical price to install a gas hot water heater is between NZD 1,500 and NZD 3,000. However, this is only an estimate, you would need our team to come over to your property and assess the job for us to give you an exact quote. Our gas fitters can provide you with a free quote so don’t hesitate getting in touch.

It’s essential to keep in mind that installation costs frequently do not include the price of the device itself. Depending on the unit’s size, features, and manufacturer, the price can differ significantly. In general, the price of a gas hot water heater ranges from NZD 800 to NZD 3,000 or more.

Gas Continuous Flow System

These systems are extremely popular and it’s easy to see why: they never run out of hot water and they are energy efficient. The unit delivers a pre-determined flow rate (10 to 32 litres per minute) every minute for as long as it runs; it does not make use of a water storage tank.

Gas continuous flow systems burn gas to heat water as it runs through a califont, this system can run on both LPG and natural gas. Gas continuous flow systems are more efficient that gas hot water cylinders, heat water on demand and do not require a tank to store water.

This hot water cylinder is good if you already use reticulated gas for space heating or cooking and want to continue this.

While this system provides unlimited hot water, using more hot water than you need is a waste of water, energy and money. Gas continuous flow systems have digital controllers that allows for a specific water temperature to be selected, a safety feature that can prevent scalding in small children. 

Working of Instantaneous/Continuous Gas Hot Water Heater

This system works when you open the hot water outlet and a sensor detects the water flow out of an outlet. This sensor is connected to the Electronic Control Unit (ECU) which controls how gas flows through the heater.

The combustion fan is started and ignition begins, this is electronic and requires electricity. The ECU also opens the gas valve and once the flame is established, the appliance will heat the water until the tap is turned off.

Advantages of Continuous Hot Water Heater

  • The biggest advantage to using this system is that it provides unlimited hot water.
  • Other advantages include saving energy and money when compared to traditional hot want cylinders
  • Gas continuous flow systems are also an excellent option for homes with small spaces, as the unit does not have a tank to store water and can be mounted outside.
  • Gas continuous flow systems have reduced gas emissions compared to other gas systems.
  • The water is also cleaner as it is not stored in a tank.
  • The design is safer.
  • The gas continuous hot water units come in size ranging from 16 litres of hot water per minute to 32 litres of hot water per minute.

Disadvantages of Continuous Hot Water Cylinder

  • It is important to note that with this system you may need to pay a fixed charge for reticulated gas supply and running costs are high if you use LPG. As with hot water cylinders, gas continuous flow systems also contribute to climate change by producing greenhouse gases.
  • Another disadvantage of this system is that it will not work during a power outage as most systems require an electrical supply. However, there are units that do not require power like Hydropower Ignition.

Gas Hot Water Cylinder System

Gas hot water cylinder systems are storage water heaters and are the most popular type of water heater installed in homes in New Zealand. Natural gas hot water cylinders can be installed using both low pressure and mains pressure, with the latter being the preferred style. 

A gas hot water cylinder burns gas to heat water in insulated tank to a temperature set by the thermostat; these normally run on natural gas. This system does not use electricity to run and can continue to heat and supply hot water during power outages. They can also be installed outside your home to free up space inside.

  • It’s important to keep in mind that the running costs for this system is relatively expensive, as you will need to pay a fixed charge for reticulated gas supply.
  • Another factor to consider is that this system will produce emissions, so while burning gas a relatively clean, it will contribute to climate change. Unlike electric hot water cylinders, you can’t put a cylinder wrap around gas hot cylinders. This may obstruct airflow and extinguish the flame. As with electric hot water cylinders, this system will also need to be set up correctly to ensure the tank water temperature is maintained at 60°C to prevent the growth of legionella bacteria. 

Frequently Asked Questions About Gas Water Heaters

To put it simply, gas water heaters are large furnaces that circulate water through their systems to heat the water. They are joined to a network of pipelines that includes an incoming hot water conduit that carries hot water to your outlets and a cold water delivery pipe.

Through a cold water supply pipe, water is carried into the sealed tank at the bottom of the cylinder. A gas burner is then placed beneath the sealed tank to heat the cold water. The water in the container raises to the top as it warms. When required, a hot water discharge conduit removes hot water.

The gas burner is regulated by a gas assembly that is installed near the water heater. This assembly has a thermostat that monitors the temperature of the water inside the tank and controls the gas burner by turning it on and off as necessary to keep the water at the desired temperature.

The hollow flue is fitted with a spiral metal baffle that captures heat and transfers it to the surrounding water to maximise the efficiency of the gas hot water cylinder. The hot water cylinder tank consists of a steel outer jacket that encloses a pressure-tested water storage tank.

A gas water heater will not work during a power outage because it relies on electricity to power the controls and the circulation pump. However, if your gas water heater has a built-in pilot light, it may still be able to heat the water as long as the gas supply is not disrupted.

It’s worth noting that a gas water heater will only be able to provide hot water for as long as there is gas available to fuel the burner. Once the gas supply is exhausted, the water heater will stop functioning.

To turn off a gas hot water system, you should follow these steps:

  1. Find the gas valve on the water heater. This is usually located on the gas line leading to the unit, and it may be a round knob or a lever.
  2. Turn the gas valve off.
  3. Shut off the electricity to the water heater.
  4. Close the cold water inlet valve connected to the water heater. This valve is usually located near the bottom of the unit.
  5. Open a hot water tap in a sink or bathtub to allow any remaining gas to escape.

It’s crucial to remember that if you smell gas you should never try to switch off a gas hot water system. In these situations, you ought to leave your house right away and dial the gas company or the fire department.

There are a few different ways to determine whether your hot water system is gas or electric:

  1. Go to the backyard of your home and search for a gas outlet or a gas metre. Your hot water system is probably fueled by gas if you see a gas switch or a gas metre.
  2. Examine the actual water heater. Electric water heaters usually don’t have a gas pipe running to them while gas water heaters would.
  3. The water heater’s control screen should be easy to find. Control screens are more common on electric water heaters than on gas water heaters.
  4. Look over your energy bills.
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