How often should a storage tank be maintained?

A domestic hot water (DHW) storage tank is an investment designed to provide a continuous, efficient, and safe supply for many years. However, like any equipment that is part of a heating system, it requires regular maintenance to maintain its performance, reduce energy consumption, and extend its lifespan.

One of the most frequent questions among homeowners, building managers, hotels and industries is: how often should a storage tank be maintained?

The answer will depend on the type of installation, water quality, usage intensity, and the manufacturer's recommendations. In this article, we explain what aspects to check, how often to do so, and why preventative maintenance can avoid costly repairs.

Why is maintenance important?

Although the storage tanks are made of high-strength materials, such as vitrified steel and polyurethane thermal insulation, they are constantly subjected to changes in temperature, pressure, and contact with water.

Over time, natural wear and tear can occur which, if not detected promptly, affects system performance and increases energy consumption.

Conducting regular inspections allows you to:

• Maintaining the efficiency of the domestic hot water system.

• Reduce the risk of corrosion.

• Detect leaks before they become a bigger problem.

• Extend the lifespan of the storage tank.

• Reduce repair costs.

• Optimize the operation of heat pumps, boilers or solar thermal systems.

  
  

How often should maintenance be performed?

There is no single interval applicable to all projects, as the use of a residential storage tank is very different from that of a hotel or an industrial facility.

However, a widely accepted recommendation is to carry out a preventive inspection at least once a year .

In facilities with high demand for domestic hot water, such as hotels, hospitals, gyms or industries, it may be advisable to carry out inspections more frequently to ensure continuous operation and avoid service interruptions.

Components that should be checked during maintenance

Magnesium anode

One of the most important elements within an accumulator pond is the magnesium anode .

Its function is to protect the interior of the tank against corrosion through a process known as cathodic protection.

Over time this component wears down naturally, as it is designed precisely to sacrifice itself and protect the vitrified steel of the tank.

During maintenance, its condition should be checked and, if it shows considerable wear, it should be replaced to maintain the anti-corrosion protection of the equipment.

Vitrified coating

Vitrified storage tanks offer excellent resistance to corrosion.

Although this coating has great durability, during inspections it is advisable to check that there is no damage caused by impacts, incorrect handling or exceptional operating conditions.

Maintaining the lining in good condition directly contributes to extending the lifespan of the pond.

Thermal insulation

The insulation is responsible for maintaining the temperature of the stored water and reducing energy losses.

During a technical inspection, it is verified that the exterior cladding remains in good condition and that there are no deformations, moisture or damage that could affect its insulating capacity.

Efficient insulation means lower energy consumption and better use of the heat generated.

Hydraulic connections

Water inlet and outlet connections must be kept free of leaks.

Even small leaks can increase water and energy consumption over time.

It is also advisable to check joints, fittings, and seals to ensure that the entire system is functioning correctly.

Safety valve

The safety valve performs an essential function by protecting the system against possible pressure increases.

During maintenance, its correct operation is verified to ensure that the tank operates within the conditions established by the system design.

Control instruments

When the storage tank works in conjunction with heat pumps, boilers, or automated systems, it is also advisable to check temperature sensors, thermometers, and other control devices.

Accurate measurement allows for optimization of the operation of the entire domestic hot water system.

Factors that can increase the frequency of maintenance

There are conditions that may require more frequent inspections.

Among them are:

• High water hardness.

• High daily consumption of hot water.

• Continuous operation throughout the year.

• Industrial facilities.

• Hotels with high occupancy.

• Sports centers.

• Hospitals.

• High-capacity solar thermal systems.

In these cases, a preventive maintenance program helps to minimize the risk of unexpected failures.

Signs that indicate a pond needs inspection

Although regular inspections are the best strategy, there are also signs that may indicate the need for a technical review.

Some of them are:

• Decreased availability of hot water.

• More time to recover temperature.

• Unexpected variations in water temperature.

• Increase in energy consumption.

• Presence of moisture near the pond.

• Unusual noises during operation.

• Decreased system performance.

In any of these situations, it is advisable to request a technical evaluation before the problem worsens.

Preventive Maintenance vs Corrective Maintenance

Many companies only get involved when a breakdown occurs.

However, this strategy usually results in higher costs and downtime.

Preventive maintenance allows for the identification of worn components before they fail, while corrective maintenance involves repairing equipment that already has a problem.

In addition to being more economical, preventive maintenance helps maintain the energy efficiency of the system and avoids interruptions in the hot water supply.

Benefits of regular maintenance

Performing scheduled inspections offers advantages for residential, commercial, and industrial facilities alike.

The main benefits include:

• Longer lifespan of the storage tank.

• Reduction of corrosion risk.

• Improved energy efficiency.

• Lower operating costs.

• Greater system security.

• Lower probability of unforeseen repairs.

• Maintaining comfort for users.

• Improved performance of the heat pump or boiler.

  
  

Who is responsible for performing the maintenance?

The maintenance of an accumulator tank must be carried out by qualified technical personnel from Termic or certified by SEC.

A professional has the necessary tools and knowledge to inspect the various components of the system, verify their condition, and detect possible anomalies that are not always visible to the naked eye.

In addition, a professional inspection ensures that the equipment continues to operate according to the manufacturer's specifications.

The importance of maintenance planning

Waiting for a failure to occur can result in higher costs, service interruptions, and even damage to other equipment in the system.

Planning regular inspections helps maintain a reliable supply of domestic hot water and protects the investment made in the installation.

A properly maintained storage tank not only retains its performance, but also contributes to improving the energy efficiency of the entire hot water generation system.

Conclusion

Maintaining a storage tank is essential to ensure safe, efficient, and long-lasting operation. While the frequency will depend on the specific characteristics of each project, performing an annual preventative inspection and increasing the frequency for high-demand installations is recommended to maximize system performance.

At Termic we offer solutions for domestic hot water (DHW) systems along with specialized technical advice to help keep your equipment operating at maximum efficiency throughout its useful life.

SEO keywords

Storage tank maintenance, domestic hot water storage tank maintenance, how often to maintain a storage tank, hot water storage tank, domestic hot water system maintenance, magnesium anode, vitrified tank, heat pump maintenance, domestic hot water maintenance, storage tank inspection, energy efficiency, hot water storage tank, preventive maintenance, storage tank Chile, domestic hot water systems.