What Is Causing My Rubine Water Heater Not To Heat?

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Installing a water heater from Rubine provides hot water whenever it is needed. However, you should take note that even if Rubine water heaters offer you the best showering experience, they may still fail if they are not properly maintained. A decrease in performance is one of the signs that your Rubine water heater is not heating.

We will discuss the causes of why your Rubine water heater is not heating.

Excessive Demand Or Insufficient Capacity

You have to make sure that your family’s demand for hot water does not exceed your Rubine storage water heater’s capacity. If it exceeds, you may end up with lukewarm water, or run out of hot water halfway during use. Hence, one thing to consider when buying a new water heater is to check for a higher water holding capacity. A suitable model that you can consider is the Rubine MT-30B matrix storage water heater.

Cold Water Due To Faulty Heating Element


One of the signs of a faulty water heater is improper water heating. If your water heater is only able to produce lukewarm water no matter how high you set the temperature, it could be a sign that there is a problem with the water heater’s heating elements.

Malfunctioning Thermostat


A malfunctioning thermostat is a water heater issue that can result in scalding water. It could even be an indicator that your water heater’s anti-scalding safety mechanism has failed! To prevent this issue, you can check the thermostat to see if it is properly set. If lowering the temperature settings does not solve the issue, it is highly recommended that you seek help from a professional. He will inspect your water heater and advise whether you should replace or repair your water heater.

There Might Be Sediment Build Up

The corroding of the internal components of a water heater can lead to the accumulation of sediments within the tank. These can diminish the transfer of heat to the water. The sediment may also travel along the pipes, lodging itself in an elbow and blocking the flow of hot water.

In this case, you may hire the services of a water heater professional. If the professional sees that the internal components are damaged due to sediment accumulation, then he will advise doing a replacement.

Internal Leaking

For storage water heaters, cold water is supplied through a dip tube. A damaged dip tube is one of the different types of water heater leaks. When this happens, the cold water mixes with the hot water stored in the tank. This results in your water heater appearing to be unable to heat water. This is also one of the signs that you should replace your Rubine storage water heater.


More piping is needed to connect the tap to the water heater if the latter is installed in another room. The hot water can lose heat as it travels through those pipes, resulting in only lukewarm water at the tap.

One such model is the Rubine MT-15 Matrix Storage Water Heater. It comes with a 5-year warranty for the heating elements, and a 7-year warranty for the inner tank, which is titanium coated to prolong its lifespan.


There can be many contributing factors behind why your Rubine water heater is not heating. This can be specific reasons like insufficient capacity and long installation distance, or age-related deterioration of the internal components. When this happens, it is a sign that you should replace your Rubine storage water heater or instant water heater with the latest model.

Water Heater City Singapore is your trusted partner for comprehensive water heater services. With over a decade of experience, we pride ourselves on being a reliable water heater company. Our services such as water heater installation/replacement including instant water heater services installation and storage water heater installations are done efficiently by our expert team. Moreover, we will ensure your storage water heaters are Licensed Installation with PUB Submission and all works comply with standards prescribed/stipulated by PUB. If required, we are also able to open a false ceiling, patch it back up, and paint it to restore it to its original condition. 

We supply a wide selection of water heaters from top brands like Ariston, Rheem, Joven, 707, Rubine, and Champs. With a proven track record of successful past projects and a number of positive customer reviews on Google and Facebook, we ensure every service we provide will be done efficiently and with the utmost attention to detail. Contact us on WhatsApp at +65 8241 0032 for transparent quotations and honest pricing for all your water heater needs!