Hot Water Cylinder and Calorifier Repair & Replacement Services


Compact Non-Storage Calorifier (plate heat exchanger type) by WH Cylinders.
Compact Non-Storage Calorifier (plate heat exchanger type) by WH Cylinders.
Insulated low loss header with white casing, cutaway showing internal design for hydraulic separation.
Insulated low loss header with white casing, cutaway showing internal design for hydraulic separation.
Replacement copper U-tube heat exchanger bundles for calorifier repair and servicing by World Heat Cylinders.
Replacement copper U-tube heat exchanger bundles for calorifier repair and servicing by World Heat Cylinders.
Example of a bespoke pre-plumbed hot water cylinder solution manufactured by World Heat Cylinders.
Example of a bespoke pre-plumbed hot water cylinder solution manufactured by World Heat Cylinders.
World Heat Cylinders domestic hot water cylinders finished with polyurethane spray foam insulation.
World Heat Cylinders domestic hot water cylinders finished with polyurethane spray foam insulation.

At World Heat Cylinders, we understand that even the most robust hot water cylinders and calorifiers can experience issues over their operational lifespan. Therefore, we offer a professional hot water cylinder and calorifier repair and replacement service across the UK. Our goal is to restore your hot water systems to optimal performance swiftly and efficiently. Whether you’re dealing with leaks, corrosion, reduced efficiency, or component failure in your cylinder or calorifier, our experienced engineers are equipped to diagnose and resolve the problem.



Common Issues We Address in Cylinders & Calorifiers


Our skilled team frequently encounters and resolves a wide array of issues affecting both hot water cylinders (unvented, vented, thermal stores) and storage calorifiers. These problems include, but are not limited to:

  • Leaks: From minor drips to significant water loss, potentially originating from vessel corrosion, faulty connections, failed safety devices, or damaged immersion heaters.
  • Corrosion: Both internal and external corrosion can compromise the integrity of cylinders and calorifiers, leading to premature failure. We thoroughly assess the extent of any corrosion and advise on the most appropriate course of action.
  • Scaling and Efficiency Loss: In hard water areas, scale build-up on heat exchange surfaces (coils, plates) or in immersion heater elements can drastically reduce thermal efficiency and significantly increase energy costs.
  • Component Failure: This includes problems with heat exchanger coils (e.g., primary coils in indirect cylinders, U-tubes in calorifiers), thermostats, pressure relief valves (PRVs), temperature and pressure relief valves (T&P valves), expansion vessels, or immersion heaters.
  • Poor Hot Water Performance: Insufficient hot water, fluctuating temperatures, or slow recovery times can indicate underlying problems with your cylinder or calorifier system.


Our On-Site Repair Process for Cylinders & Calorifiers


When you contact World Heat Cylinders for a repair to your hot water cylinder or calorifier, we follow a process designed for efficiency and minimal disruption to your operations:

  1. Initial Consultation: Firstly, we discuss the symptoms your unit is exhibiting. Providing photographs of the cylinder or calorifier and the specific issue can often help our team make a valuable initial assessment.
  2. Site Visit & Diagnosis: In most instances, our qualified engineers will attend your site. They will conduct a thorough inspection of the unit to accurately diagnose the fault.
  3. Repair or Recommendation: If a repair is both viable and cost-effective, we aim to complete it during the site visit, utilising high-quality spare parts. We are proficient in addressing leaks, replacing faulty components, and performing essential maintenance on a wide range of units.


Bespoke Cylinder & Calorifier Replacement Solutions


Occasionally, a hot water cylinder or calorifier may be corroded beyond economical repair. Alternatively, an older, less efficient unit might warrant replacement to improve performance and reduce running costs. In such situations, World Heat Cylinders offers an expert replacement service. Our engineers will meticulously measure the existing vessel, its tappings, and pipework connections. Consequently, we can design and manufacture an exact, or an improved, like-for-like replacement cylinder or calorifier. This careful approach aims to minimise, or even eliminate, the need for costly and disruptive existing pipework modifications, thereby ensuring a smoother and quicker changeover.

We have the capability to replicate outdated or obsolete models from various manufacturers. Furthermore, we can propose modern, energy-efficient alternatives from our extensive ranges, including unvented cylinders, storage calorifiers, and thermal stores.



Why Choose World Heat for Your Repair & Replacement Needs?


  • Comprehensive Expertise: Decades of experience in designing, manufacturing, and servicing both hot water cylinders and calorifiers.
  • Skilled Engineers: Our qualified team is proficient in handling a wide array of repair challenges for all types of units.
  • UK-Wide Coverage: We offer our repair, assessment, and replacement services across the entire United Kingdom.
  • Quality Parts & Materials: We use high-standard components and manufacturing materials for durable repairs and long-lasting replacements.
  • Focus on Minimising Downtime: We understand the critical importance of your hot water supply and consistently strive for prompt, effective solutions.
  • Bespoke Manufacturing Capability: For replacements, we possess the in-house ability to build exactly what your system requires.


Get in Touch for Cylinder & Calorifier Support


If your hot water cylinder or calorifier requires attention, or if you are considering an upgrade or replacement, please do not hesitate to contact our technical sales team. We are ready to discuss your specific situation, provide expert advice, and, if necessary, arrange a site visit.

You can reach us by calling 0161 343 8610, emailing sales@whcylinders.co.uk, or by visiting our comprehensive contact page to submit your enquiry.