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Which Type of Water Heater is the Most Energy Efficient?

| Wednesday December 14, 2022

Water heaters are household appliances that many of us use every day, but which one is the most energy efficient? This is a question that we get asked a lot, and it’s one that we’re happy to answer.

There are many different types of water heaters on the market today, and it can be hard to know which one is the most energy efficient. In general, the most energy-efficient water heater is going to be the one that best meets your specific needs. For example, if you have a large family and use a lot of hot water, you’ll want to choose a water heater with a larger capacity. On the other hand, if you live alone and don’t use a lot of hot water, you can choose a smaller water heater and save on energy costs. 

Here are some of the most popular types of water heaters and how they compare in terms of energy efficiency: 

  1. Tankless Water Heaters 

Tankless water heaters are a popular choice for many homeowners because they are very energy efficient. These water heaters don’t store hot water in a tank, so they don’t have to work as hard to keep the water hot. 

For example, Rheem’s Prestige Range of Electric Instant Water Heaters only consumes energy when switched on. These instant water heaters are outfitted with a replaceable Incoloy heating element which ensures fast heat transfer. This means that when switched on, you would be able to enjoy an instantaneous stream of hot water coming out from your shower head. 

  1. Solar Water Heaters 

Solar water heaters are another energy-efficient option. These water heaters use the sun’s energy to heat the water, so they don’t have to use as much electricity or gas. 

With Rheem’s Premier Hiline and Premier Loline Solar Water Heaters, you can utilize solar energy to heat the water used for your showers. Solar water heaters can help you save anywhere from 50% up to 80% on your water heating bills in the long run. Thus, while this may be a significant upfront investment, the long term savings are worthwhile. 

  1. Gas Water Heaters 

Gas water heaters are a common choice for many homeowners because they are less expensive to operate than electric water heaters. However, gas water heaters are not as energy efficient as electric water heaters because they rely on natural gas or propane for fuel, which is less efficient than electricity. Furthermore, gas water heaters require a pilot light, which burns gas and reduces the overall efficiency of the unit. Examples of gas water heaters include tank-style water heaters and tankless water heaters. Tank-style water heaters are the most common type of gas water heater and use a sealed tank to store heated water. Tankless water heaters use a gas burner to heat water on demand and do not need a storage tank.

  1. Electric Water Heaters 

Electric water heaters are popular because they are almost effortless to install. However, electric water heaters are not as energy efficient as other types of water heaters because they use more electricity to heat and maintain the water temperature. For example, an electric water heater must use electric heating elements to heat the water, which requires more energy than a gas water heater. 

With Rheem’s electric storage water heater range, you can enjoy fast heating and endless hot showers. These storage water heaters are equipped with an Incoloy heating element that provides faster heat transfer. The inner tanks are also lined with CFC free polyurethane foam which is great for retaining heat, this means that less energy would be required to reheat the water in the storage tanks and that users can enjoy shorter heating cycles. 



Water heaters come in a variety of types and sizes, each with its own advantages and disadvantages. The most energy-efficient water heater is the one that best meets your hot water needs while minimizing operating costs.

So, which type of water heater is the most energy-efficient? It really depends on your needs and budget. If you want the most energy-efficient water heater, solar is the way to go. But if you’re on a budget, a traditional storage-tank water heater will be the most affordable option.

Rheem Malaysia carries an extensive range of water heating solutions for every unique water heating need. With almost 100 years in the water heating industry, Rheem has constantly innovated and created new advancements in water heating technologies. With Rheem, you can enjoy reliability, durability, and high-quality hot showers for many years. 

Browse our extensive range of instant water heaters, storage water heaters, and solar water heaters today: 





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