Water Heater Repair, Replacement or Installation

In Singapore, water heaters are almost present in every household. Generally, there are 2 types of water heaters in Singapore which is Storage water heater and Instant water heater.

What are Storage water heaters and how do they work?

A Storage or tank water heater delivers a ready supply of hot water.

For Storage water heaters available in Singapore market, each Storage water heater is made up of a storage tank that can hold up to 100 litres of continuously hot water that may be distributed throughout your home. When the tap is turned on, cold water is heated and stored before being reheated. The Storage water heater heats cold water from the bottom of the tank while releasing hot water from the top of the tank, ensuring that the tank is always filled. Because water is constantly heated in Storage water heaters, energy can be wasted even when it is not in use – hence it is important to turn them off after each use.

In Singapore, there are several options of Storage water heaters that you can choose from. Electric, solar-powered, heat-pump and latest models are digital ones. Heat pumps and solar-powered storage water heaters are both environmentally friendly options because they utilise renewable energy sources. A heat pump Storage water heater uses a compressor to transfer heat from the surrounding air into the tank and heat the water. For digital storage water heaters, they come with digital control panels that give greater control over the heater while using electricity more efficiently to save energy.

A storage water heater can be installed in the ceiling, cabinet, basement, or garage (for example, hidden under a false ceiling).

What are Instant water heaters and how do they work?

Without using a storage tank, an Instant or tankless water heater heats water on demand.

When you turn on the tap, water is quickly heated to the correct temperature as it passes through the heat exchanger of the Instant water heater. Only while the instant water heater is in use does energy get used, resulting in greater long-term savings. On the other hand, instant water heaters usually have a higher initial cost.

For Instant water heaters available in Singapore market, there are mainly 2 options- electric and gas.

According to an energy study by NUH published on City Gas’s website, Gas water heaters are generally more environmentally friendly, emitting 63% less carbon. City Gas, Singapore’s town gas and natural gas utility provider, offers a variety of Gas water heaters, including ones that are suited for HDB flats.

Instant water heaters are a space-saving choice since they do not have water storage tank. Instant water heaters are typically installed on the wall, close to the place of usage, such as in the shower. However, because it is visible, it will undoubtedly alter the beauty of your bathroom!

What to take note of when choosing the type of water heater?

Firstly, it is important to note that water pressure and the fixtures used will greatly impact showing experience and the look of your bathroom.

Because the unit’s output limits the flow rate to roughly three to four litres per minute, water pressure may be an issue with instant water heaters. Due to the flow restriction of instant water heaters to ensure that water temperature of up to 39 deg C can be reached, water pressure is being reduced. Water temperatures may not be consistent with instant water heaters because the temperature is dependent on the water flow rate, which is also affected by other users in your household.

Storage water heaters, on the other hand, provide pre-heated water with a high-pressure flow of roughly 10 litres per minute and temperatures up to 70 degrees Celsius. This is something to keep in mind if you enjoy very hot showers.

If you are opting for Instant water heater, it’s preferable to stay with regular hand showers. Storage water heaters, on the other hand, can accommodate practically any form of shower fixture, including rain showers, massage jets, and bathtubs.

In a nutshell, Instant water heaters provide hot water on demand but with lower water pressure and inconsistent temperature consistency, whereas Storage water heaters provide better water pressure and consistent temperatures, but the amount of hot water available at the point of use is determined by the tank size.

Second factor to consider when choosing the type of water heaters would be installation space. Because conventional Storage water heaters are big and less pleasing to look at, they are usually hidden, so you’ll need to make room for their installation. HDB has already assigned a location for the storage water heater in the new HDB BTO flats.

The amount of space needed to place the water heater is also dependent by the size of the water heater.  In Singapore, many households are choosing Storage water heaters that have a tank size of 40litres that can typically meet the needs of a family size of 3 to 4 people. Compared to Storage water heaters, Instant water heaters are mounted on the wall and can be installed easily at any time. This makes Instant water heaters an excellent choice for homes that are rented out on a short-term basis. Depending on how much water your home uses, you might need more than one unit.

Lastly, the amount of maintenance needed is also a necessary factor to take note of. Instant water heaters can last 5-7 years on average, while Storage water heaters can last at least 10 years. Storage water heaters should have their tanks flushed every 5 years, while Instant water heaters should have their wiring checked every 3-5 years.

Malfunction of the water heaters may be caused by wear and tear of the heating element inside the water heater and thus making it unable to heat up properly.


Whether you are thinking to repair, replace or install your water heater, contact Plumbing Hub via WhatsApp or call us at +65 8126 2092 to schedule an appointment. You can count on us to deliver professional and reliable service with quality workmanship.