The hot water cylinder and continuous flow water heater systems are popular options for guaranteeing a consistent supply of hot water in Wellington homes and businesses. Both of these systems deliver warm water, but they do so in different ways, each having advantages and factors to be taken into account.

We delve into the distinctions between these two systems so that you may comprehend how they work and choose the best solution for your hot water requirements. Whether you’re exploring traditional hot water storage or the modern on-demand approach, continue reading to get a comprehensive information on the differences between the hot water cylinder and the continuous flow water heater system.

Continuous flow water heater and hot water cylinders are two different types of water heating systems commonly used in New Zealand.

What is a Hot Water Cylinder?

A hot water cylinder, also known as a hot water tank, is a traditional method of heating water. It is a large insulated cylinder that stores and heats a quantity of water. The cylinder is connected to a heat source, such as an electric or gas boiler, and maintains a constant supply of hot water for use throughout the house. The water is typically heated and stored in the cylinder until it is needed.

What is a Continuous Flow Water Heater?

Continuous flow water heater is a type of a instantaneous hot water system. Instead of storing hot water in a cylinder, a continuous flow water heater system heats the water on demand as it passes through the unit. When a hot water tap is opened, cold water flows into the system, which then rapidly heats the water to the desired temperature before it reaches the tap. This type of system provides an unlimited supply of hot water, as it does not rely on stored water.

The main difference between the two systems is how they heat and store hot water. A hot water cylinder requires space to accommodate the cylinder itself, whereas a continuous flow water heater system is more compact and does not require storage space. A continuous flow water heater system can provide hot water continuously, whereas a hot water cylinder may deplete its stored hot water if used excessively and take some time to heat up a fresh supply.

Difference between Continuous Flow Water Heater and Hot Water Cylinder

Efficiency and Energy Consumption

Continuous flow water heaters are known for their energy efficiency. Since they only heat water when it is needed, there is no energy wasted on maintaining the temperature of stored water like in hot water cylinders. This on-demand heating helps to minimise standby heat losses and can result in energy savings over time. Hot water cylinders, on the other hand, may experience energy losses due to heat dissipation from the stored water. However, it’s worth noting that the energy efficiency of both systems can vary depending on factors such as the specific model, insulation, and usage patterns.

Capacity and Flow Rate

There is a difference between the capacity and flow rate of continuous flow water heaters and hot water cylinders. Continuous flow water heaters are designed to provide hot water on demand and can deliver a nearly unlimited supply of hot water, as long as the unit can keep up with the flow rate required. The flow rate is determined by the capacity and performance of the specific unit. Whereas, hot water cylinders have a predetermined storage capacity. A HWC can typically store 100 to 300+ litres of water. The availability of hot water is limited and depends on the amount stored in the cylinder. Once the stored water is used, there may be a waiting period for the cylinder to heat up a fresh supply of hot water.

Water Heating Method

Continuous flow water heaters are also known as tankless water heaters. These hot water heaters heat water on demand as it flows through the unit. When a hot water tap is turned on, cold water enters the unit, which then rapidly heats the water using a heat exchanger before it reaches the tap. This means there is no need for a storage tank or cylinder to store hot water.

On the other hand, hot water cylinders store a predetermined amount of hot water in an insulated tank and maintain its temperature until it is used. The hot water stored in the cylinder can be depleted if used excessively, and it takes time for the cylinder to heat up a fresh supply of hot water.

Space Requirements

Continuous flow water heaters are typically more compact and space-efficient compared to hot water cylinders. Continuous flow water heaters don’t require a storage tank, they can be wall-mounted or installed in smaller spaces, making them suitable for homes with limited space availability.

Hot water cylinders require dedicated space to accommodate the sizeable cylinder, insulation, and associated pipework. They are commonly installed in utility rooms, garages, or other designated areas with sufficient space.

When making a decision between the which hot water system you should get, it’s important to consider the above factors along with individual preferences, available resources, and specific needs to choose the most suitable option for your household. If you are looking for an expert hot water system installer to discuss best option for you, then get in touch with our Southern at 0800 484 353.