Do you need a new hot water tank installed or an existing tank repaired?

Is your hot water unreliable, or are you noticing leaks and rising energy bills? It might be time to repair or replace your hot water tank. Celsius Plumbing specialise in:

Hot water tank repairs – Fixing leaks, pressure issues, and faulty heating electric immersion elements.
New installations – Replacing outdated water tanks with modern, energy-efficient ones.
Maintenance & servicing – Preventing costly breakdowns and improving efficiency.

Not sure what’s best? Our hot water experts can assess your setup and recommend the right solution.

Types of hot water tanks for your home

Choosing the right hot water cylinder depends on your home’s water pressure, available space, and heating system. At Celsius Plumbers, we install and repair both unvented pressurised cylinders and gravity fed (vented) cylinders. But what does all this water tank terminology mean?

Newly installed unvented hot water tank in this Edinburgh home.

Unvented pressurised hot water tanks

These connect directly to the mains water supply, ensuring high pressure and a strong flow rate throughout your home.

Unvented hot water tanks are most commonly found in newer build homes from 2000 onwards. They don’t require a separate cold water storage tank, making them ideal for modern properties where space is limited.

Well insulated and highly efficient, unvented cylinders offer excellent heat retention, reducing energy consumption. If you like strong powerful showers, then this tank is for you.

Gravity open vent hot water tanks

These traditional systems rely on a cold water tank (usually stored in the loft or hall cupboard) to supply water under gravity pressure. They’re often more affordable to install and work well in homes where mains pressure is weak.

If water pressure is a concern, adding a shower pump can enhance performance.

Top Tip – if you currently have this type of set up and don’t use much hot water, changing over to a smaller mains pressured water heater and removing both your cold water and hot water tanks could be the right solution for you.

New hot water tank next to an old fashioned hot water cylinder.

Do I have a hot water tank or cylinder?

It’s a good question and something customers ask us all the time. In short, it means the same thing.

Comparing hot water tanks (cylinders) - which one is right for you?

Feature	Unvented Pressurised Cylinder	Gravity Open Vent Cylinder
Water Pressure	✅ High, suitable for powerful showers	❌ Lower, may need a shower pump
Cold Water Tank Required	❌ No	✅ Yes, in the loft
Efficiency	✅ More efficient, stores water under pressure	❌ Less efficient due to gravity feed
Space Requirement	✅ Compact, no extra tank needed	❌ Requires loft space or extra cupboard space for the cold water tank
Installation Cost	❌ Higher due to regulations and components	✅ More affordable installation
Best For	✅ Homes with strong mains water pressure	✅ Homes with weaker mains pressure

Need help? Get in touch with Celsius

I have hot water flow from my new tank which is great as it was very bad before. The new shower is great and I am extremely happy with the finished product. My new tank also appears to be saving me money in electricity. The engineers were all very pleasant when they came out too.

C Lafferty | HOMEOWNER, EDINBURGH

CHAT WITH US

We can help you through WhatsApp

Message us on WhatsApp

Undertaking a repair to a leaking immersion heater.

Immersion heater repairs in Edinburgh

For homes using an immersion heater to heat hot water, a faulty immersion heater can become temperamental and stop working properly over time. If you’re experiencing lukewarm water, high electricity bills, or have no hot water what so ever, our plumbers can diagnose and repair hot water immersion faults. Things like –

Faulty heating elements – We replace worn out immersion heaters to get your hot water working again.
Thermostat issues – We can quickly diagnose and replace fault immersion thermostats.
Electrical issues – We can test the power supplying your immersion water heater to make sure everything is working and safe to use.

Picking up a shower pump to solve a low water pressure issue.

Struggling with low water pressure? Install a shower pump

If you have a gravity fed hot water and struggle with low water pressure, installing a shower pump can significantly boast performance. A pump boosts the flow rate, ensuring stronger showers and better water pressure throughout your home. We install all leading shower pump brands, ensuring you get the best solution for improving your water pressure. Our range includes:

Salamander Shower Pumps
Grundfos Shower Pumps
Stuart Turner Shower Pumps
Monsoon Shower Pumps

Call us on 0131 258 0848 today for expert advice.

This hot water tank is leaking so needs repaired.

We also fix leaking hot water tanks

If left for too long, a small leak on your hot water tank can turn into a bigger issue. If you’ve noticed a leak, or need a repair on your hot water tank, get in touch on 0131 258 0848 and we can send a plumber out.

Top Tip! No hot water? It might not be your tank, it could be a boiler repair or a boiler service you need instead. We’re happy to help you to diagnose the issue.

Replacing an old gravity hot water tank with a new insulated tank.

Replace your old gravity hot water tank with a new insulated tank

With a sleek, insulated jacket, a new gravity hot water tank isn’t just more efficient, it keeps your hot water hotter for longer and can even improve your hot water flow rate.

Gain more storage space? Before and After examples

Before

Old set up in Edinburgh flat with hot and cold water tanks in cupboard.

Look familiar? Jam packed cupboard!

Look how much space this old plumbing tank set up takes up in this small Edinburgh city centre flat. The entire cupboard is filled – and it had poor water pressure!

After

New set up with hot water tank replaced and lots of space.

More space & better efficiency

Look at the options the homeowner now has to put up some shelving and turn this into a usable airing cupboard. Who doesn’t like extra storage, right?

Before

Old water tanks taking up lots of space in this Edinburgh cupboard.

Typical traditional setup in Edinburgh

If you have this same hot and cold water tank set up in your Edinburgh property, get in touch, as there is a better more efficient way to heat your water. Again, poor low flow water pressure is common with this set up.

After

If you don't need lots of hot water consider an Ariston water heater.

Space saving hot water setup

A great way to create extra space and that’s exactly what our customer in Portobello Edinburgh wanted. No need for lots of hot water, but they really wanted the extra cupboard space. High mains water pressure on hot and cold water is also a huge benefit from this system.

Celsius plumbers installing a new Ariston mains water heater.

No bath? Why not consider an Ariston mains water heater?

An Ariston mains water heater is a compact, space saving alternative to traditional hot water tanks, perfect for homes that don’t use a lot of hot water, like my grannie! Instead of heating up an entire tank every day, it only heats what you need, meaning less money spent on your electricity bills. This makes it perfect for elderly homeowners, those with electric showers, or anyone who doesn’t require large amounts of stored hot water. It provides instant hot water for sinks but isn’t suitable for homes with baths, as it lacks the capacity for high demand usage.

Looking for an efficient, space saving solution? Ask Celsius about Ariston mains water heater installation!

Unvented hot water tank servicing in Edinburgh

To keep your unvented hot water tank operating safely and efficiently, annual servicing is recommended. A professional maintenance service from Celsius helps to:

Prevent breakdowns – Identifying issues before they turn into costly repairs.
Improve efficiency – Ensuring best performance and helping to reduce your energy bills.
Extend lifespan – Proper care can add years to your system’s life.

We recommend an annual service to keep your system in top condition and the manufactures warranty active.

Get your unvented tank serviced!

Choose Celsius Plumbers for your hot water tank repair or replacement

If you’re based in Edinburgh and need a hot water tank replacement or repair, you’re looking for a plumber who responds quickly, arrives on time, and provides a hassle-free service. That’s exactly what you get with Celsius Plumbing & Heating. We make the process smooth and stress-free so you can get back to what matters most.

Our plumbers are able to diagnose and fix most issues on the spot, thanks to the parts we carry in our vans. Plus, we provide a 12-month aftercare service on all work we carry out, giving you peace of mind that your hot water system is in safe hands.

From servicing your boiler or installing new boilers right through to tap repairs or new radiators, you can rely on our team for full plumbing services.

Get in touch about your hot water tank repair

If you are ready to get your hot water tank repaired or replaced by the Celsius Plumbing team, please click the ‘Book a Repair’ button below, or phone us on 0131 258 0848.

Book a hot water tank repair

The water tank (in the attic of a block of flats) was overflowing so I called the trader who came to fix the problem within three hours.

DEAN | LANDLORD, CRAIGLOCKHART

How much does it cost to install a hot water tank?

The cost depends on the type of tank and installation complexity. Unvented hot water cylinders are generally more expensive due to additional safety measures, while gravity-fed systems tend to be more affordable.

Are a hot water tank and a hot water cylinder the same thing?

Yes! These terms are often used interchangeably and refer to the same type of storage unit that holds heated water for your home.

How often should I service my unvented hot water tank?

To ensure safe and efficient operation, we recommend servicing your unvented cylinder once a year. Gravity tanks do not need serviced.

Do unvented hot water cylinders increase energy bills?

While they may use more energy initially, modern unvented cylinders are well-insulated, helping retain heat efficiently and potentially lowering energy bills over time.

Can I switch from a gravity-fed system to an unvented system?

Yes! However, your home’s mains water pressure must be checked to ensure it meets the required standards for an unvented system. Installation must also comply with building regulations.

Do gravity-fed hot water tanks need servicing?

Unlike unvented systems, gravity-fed hot water tanks do not require annual servicing. However, it’s a good idea to check for leaks, limescale buildup, and other potential issues periodically.

Hot water tank replacement & repairs in Edinburgh