Can you repair a leaking hot water cylinder?

If your hot water cylinder is leaking, the short answer is: it most likely can’t be satisfactorily repaired. In general, if the cylinder itself is leaking due to cracks, corrosion, or significant damage, repairing it is not a viable or economical option. In these cases, the best solution is usually to replace the entire cylinder.

Hot water cylinders are under constant pressure, and over time, they can develop wear and tear, particularly if they are old or have not been properly maintained. Leaks can occur due to rust, scale build-up, or structural weakening of the tank, and once these issues have set in, a repair is unlikely to fix the root cause of the problem for the long term. Moreover, attempting to repair a leaking cylinder could be a temporary solution at best, and you might find yourself dealing with the same issue again quickly.

In most cases, replacing the cylinder is more cost-effective in the long run. A new, modern hot water cylinder will not only resolve the leak but also be more energy-efficient, saving you money on your heating bills. New cylinders typically come with warranties, so you won’t have to worry about unexpected repairs for several years.

If you suspect your cylinder is leaking, it’s best to have a professional plumber assess the situation. They can determine the extent of the damage and advise you on whether a repair might be possible or if replacement is the most practical solution. While replacement can be a significant upfront cost, it’s often the best option for ensuring reliable hot water and long-term efficiency in your home.