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In this article, we will explore the concept of attic water storage tanks, the prices for replacement, Irish suppliers, frequently asked questions and our expert answers, loft water tank importance in maximizing space and convenience in residential properties in Ireland and the health and damage risks of overlooking maintenance or replacement of your loft water storage tank.

Table of Contents

Advantages of Loft Water Storage Tanks


By utilizing the often-underutilized attic space for water storage, homeowners can free up valuable space in other areas of the house.


Having water readily available in the loft eliminates the need to rely solely on external water sources, providing convenience.

Potential cost savings

Loft water storage tanks can help reduce water bills by utilizing rainwater harvesting systems, leading to potential cost savings.

Attic water tanks offer several benefits, including space-saving, convenience, and potential cost savings. By utilizing the often-underutilized attic space for water storage, homeowners can free up valuable space in other areas of the house. Having water readily available in the attic eliminates the need to rely solely on external water sources, providing convenience. Additionally, attic water storage tanks can help reduce water bills by utilizing rainwater harvesting systems, leading to potential cost savings.

Types and Sizes of Attic Water Storage Tanks

Bladder tanks

Bladder tanks are a popular choice for attic water storage. They are flexible and can expand or contract based on the water volume.

Polyethylene tanks

Polyethylene tanks are durable and lightweight, making them suitable for attic installations. They come in various sizes to accommodate different water demands.

cold water tank replacement
Attic water storage tanks

Fiberglass tanks

Fiberglass tanks are known for their strength and resistance to corrosion. They are a good option for long-term attic water storage solutions.

There are various types and sizes of loft water storage tanks available in the market. When choosing the right tank for specific needs, it’s important to consider factors such as available space, water usage requirements, and budget. Some common types of loft water tanks include bladder tanks, polyethylene tanks, and fiberglass tanks. The size of the tank will depend on the water demand and the available space in the attic.

attic cold water tanks

Attic water storage tanks

Attic Tank Insulation

Insulation plays a crucial role in maintaining the water temperature and preventing heat loss in attic water storage tanks. Proper insulation helps to minimize energy consumption and ensures that the stored water remains at the desired temperature. It is recommended to insulate the tank and the pipes connected to it to prevent heat loss and maintain water quality.

Cleaning and Maintenance

Proper cleaning and maintenance are essential for ensuring the longevity and water quality of attic water storage tanks. Regular cleaning helps to prevent the buildup of sediment and contaminants. It is important to follow manufacturer guidelines for cleaning and maintenance, which may include flushing the tank, inspecting for leaks, and replacing filters if applicable.

Attic Conversion Costs

Converting an attic to accommodate water storage tanks may involve certain costs. Factors to consider include the size of the attic, the type and size of the tank, insulation materials, and any necessary plumbing work. It is advisable to consult with professionals to assess the feasibility and estimate the costs associated with attic conversion in Ireland.

Alternative Uses of Attics

While attic water storage tanks are a popular choice, lofts can also be utilized for storage purposes. However, it is important to consider factors such as weight-bearing capacity, accessibility, and insulation requirements when using the attic for storage.

Risks of a neglected attic cold water storage tank

Here’s an overview of some potential health risks associated by not replacing attic water storage tanks:

For more info on symptoms visit the HSE here

Legionella risks

Legionella is a type of bacteria that can proliferate in water systems like cold water storage tanks found in attics. Here’s a more detailed look at how it grows:

For Legionella to multiply, it requires temperatures between 68-122°F. Water stored in an attic tank is essentially a large thermal mass that stays within this ideal range.

The bacteria also needs nutrients and protection. Biofilms containing minerals, organic matter and other microbes line the interior of tanks and provide a safe anchoring place for Legionella colonies to anchor and feed. Over time, these layers grow thicker.

Areas near the bottom sediment are even warmer due to insulation by overlying water. Legionella thrives in these undisturbed zones away from flow disturbances.

Additional factors conducive to growth include low chlorine levels in fed water, and a neutral pH between 6.5-8.5 which is typical of many localized supplies.

When showering or faucets are turned on, Legionella colonized in dormant biofilms can become aerosolized in tiny droplets. If these contaminated mists are inhaled, the bacteria have a means to infect vulnerable lungs.

Regular thermal shocking of stored water above 140°F during chlorine disinfection cycles helps disrupt biofilms and kill Legionella before colonies reach problematic loads. Proper tank maintenance is key to preventing problematic proliferation.

In summary, attic tanks present ideal conditions for Legionella to take hold within biofilm niches if protective measures aren’t followed consistently. Diligence is important for assuring microbial safety of supplied water.

In general, routine tank maintenance and inspection helps mitigate risks. Proper sealing, insulation, lid fitting and plumbing checks can prevent moisture issues, bacteria growth and detect any mechanical faults early before they worsen. Ventilation also disperses any gases. With diligent care, attic water storage can be performed safely in most homes.

The Top Attic Water Storage Tank Suppliers and Installers in Ireland

Supplier nameCountyInstalls?Supplies?Phone numberWebsite
24 Hour Plumber DublinDublinYesYes1800 209 109
25 Hour Plumber MeathMeathYesYes046 901 0094
26 Hour Plumber KildareKildareYesYes045 579 047
27 Hour Plumber LouthLouthYesYes041 986 5064
The Best Attic water tank supplier in Ireland 2023

Attic Water Storage Tanks FAQ

How much does an attic water storage tank cost in ireland?

cold water tank replacement

The cost of an attic water storage tank replacing in Ireland can vary significantly depending on the size and level of work required, but on average homeowners can expect to spend between €150-€500. Larger or more complex projects may exceed €500.

What are the most common attic water tank sizes?

Some of the most common attic water tank sizes found in Irish homes include 100L, 150L, 200L, 250L, 300L and 400L. Tanks between 150-300L are sufficient for the average 3-4 bedroom house.

How to clean an attic tank?

To clean an attic tank, it’s best to start by draining the water. Then scrub the interior thoroughly with a bottle brush and disinfectant cleaner to remove any built-up sediment or algae. Rinse well before refilling. Clean lids and seals as well to keep the tank sanitary.

What is the water tank in the attic for?

The small tank located in many attic spaces is a cold water tank. It stores water for showers, sinks and other fixtures throughout the home.

What are attic tank lids?

Attic tank lids are the covers that fit securely onto the tops of attic water tanks. They help insulate the tank and prevent evaporative heat loss. Lids usually have a sealed inspection hole as well.

Why are water tanks found in attics?

Attics provide ideal locations for water tanks because it allows gravity to distribute water throughout the home’s plumbing network. The height helps water pressure too. Tanks are also out of the way and protected from freezing in the attic space.

How does attic water tank work?

Attics can absolutely be adapted for storage use. However, appropriate flooring and structural reinforcements may be needed depending on the load to be stored. Proper ventilation is also important to avoid moisture issues.

Attic water storage tanks

What are the 2 tanks in the attic for?

The 2 tanks in the attic are for hot water storage and cold water storage.

How much does it cost to replace an attic water tank?

It typically costs between €600-€1000 to replace an average sized attic water tank depending on size and materials.

Should attic water tanks be covered?

Attic water tanks should always be covered to prevent heat loss and contamination.

How long do water tanks in the loft last?

Water tanks in the loft usually last 10-15 years but can last longer with proper care and maintenance.

Can I remove water tank from loft?

Yes, you can remove a water tank from the loft if not needed with your system.

How much water should be in a central heating header tank?

A central heating header tank should be around 1/3 full, so 30-50 litres.

How much does it cost to replace a water tank Ireland?

Replacing a standard size water tank costs around €600-€1000 on average depending on size and materials.

Do you need a water tank in the loft with a combi boiler?

You do not need a water tank in the loft with a combi boiler as it does not require storage.

How much does it cost to replace a hot water tank Ireland?

Replacing a standard size hot water tank costs around €600-€1000 on average depending on size and materials.

What does an expansion tank in the loft do?

An expansion tank in the loft absorbs pressure surges and stops water hammering in the system.

How much does an attic water tank hold?

The average attic water tank holds 150-200 litres.

How do I clean my attic water tank?

To clean an attic water tank, drain and flush it with a hose, scrub inside with brush if needed, then refill.

How do I get rid of an old water tank in my loft?

Contact a licensed plumber to dispose of an old tank properly according to local regulations.

Why is my attic tank constantly filling?

If an attic tank is constantly filling there may be a leak or faulty ball valve that needs repair.

Is it hard to change a water tank?

Replacing a water tank is not difficult for an experienced plumber but does require draining the system first.

When should a water tank be replaced?

A water tank should be replaced if it is 10-15 years or older, rusty, leaking or not heating properly.

Is it worth installing water tanks?

Water tanks are worth installing for homes that need hot water storage or need to be pressurized.

Does a water tank need to be in the loft?

A water tank does not necessarily need to be in the loft, it can be located elsewhere in the home if convenient.

Why is my attic water tank making noise?

Noise from an attic tank usually indicates it needs securing, insulation or there is air in the system lines.

What size loft water tank do I need?

The size of loft tank needed depends on heating system and household needs, typically 150-300L works for family homes.

What is the difference between a loft water tank and a normal water tank?

Loft tanks are larger and used for properties with gravity fed systems. Standard tanks are smaller and installed lower in the home.

Do loft water tanks cause condensation?

Covered tanks do not cause condensation issues, but uncovered tanks can if insulation is poor.

Why do old houses have water tanks in the loft?

Old houses had tanks in lofts to use gravity rather than pumps to feed water to radiators before combination boilers existed.

Can water tank in loft freeze?

With proper insulation, tanks in lofts are very unlikely to freeze even in cold weather.

Should I remove water tank from loft?

You can remove an old unnecessary tank from the loft after consulting a plumber first.

Do I need to clean my water tank in loft?

Yes, tanks in lofts should be cleaned periodically, typically every 2-5 years depending on water quality.

What to do if water tank in loft is leaking?

If a loft tank is leaking, drain it and repair or replace as needed depending on the leak type and extent.

Are loft water tanks safe?

Properly installed and maintained loft tanks are safe. The key is keeping them covered and insulated.

How do you know if you need a new water tank?

Signs a tank needs replacing include rust, leaks, poor heating, and age 10+ years usually.

Should water tank in attic be insulated?

Attic tanks should always be insulated to prevent freezing and maximize efficiency.

How do I keep my water tank warm in the winter?

Keep the tank area warm in winter by ensuring good home insulation and ventilation in that space.

Do water tanks need insulation?

Yes, all water tanks benefit from insulation to maintain temperature efficiency.

Can I remove old water tank from loft?

An old tank can be safely removed from the loft by a licensed plumber.

Can a water tank freeze in the loft?

With proper insulation a tank in the loft has very little risk of freezing even in cold weather.

How much does it cost to fit a new water tank?

Fitting a new tank typically costs €600-€1000 depending on size, but can be more for complicated installations.

How do I stop my loft water tank from freezing?

Add extra insulation, keep air vents clear, and use a thermostatically controlled tank heater if needed to prevent freezing.

What are the rules for water tanks in the Ireland?

The key rules are that tanks must be installed to code by a licensed plumber and have local approvals if in an attic.

Can I get rid of my water tank?

You can get rid of an unnecessary tank with approval from your plumber to ensure your home’s system still meets regulations.

Contact 24 Hour Plumber if you need Attic Water Tank Replacement. We cover all of Dublin city and county as well as the surrounding counties of Louth, Meath, Kildare, and Wicklow.