Hot Water Cylinders replacement

Upgrade to Energy Efficiency with Stillorgan Gas:

Your Ultimate Guide to Hot Water Cylinders replacement

Thinking about swapping out your hot water cylinder? Don't worry, we've got you  covered with our in-depth guide to help you pick the perfect hot water tank for your needs and plumbing system. Discover the differences between vented and unvented cylinders, get insights into replacement costs, figure out the right cylinder size, and understand the contrasts between copper and stainless steel. Plus, we'll walk you through immersions and other important considerations with practical advice.

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Types of Hot Water Cylinders

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  • Indirect Cylinders: Used in central heating systems, these cylinders use a coil to separate domestic hot water from central heating water.

  • Direct Cylinders: Ideal for back boilers or electrical immersion heating, these cylinders lack a coil for water separation.

  • Vented Cylinders: Designed for gravity-fed plumbing systems, open vented cylinders prevent pressure spikes when heated.

  • Sealed Cylinders: Unvented cylinders for pressurized plumbing systems, featuring an expansion vessel for safety.

Benefits of Replacing Your Hot Water Cylinder

Upgrading your hot water cylinder can lead to up to a 25% reduction in annual hot water fuel expenses. Modern cylinders, highly insulated, retain heat for longer periods, resulting in lower fuel bills.


Choose from copper or stainless steel options with the added benefit of a rapid recovery coil, reducing the wait time for heated water. Opt for an energy-efficient stainless steel cylinder for enduring performance.

Why Choose Stainless Steel?

  • Low heat loss, ensuring hot water stays hot.

  • Faster heat-up time with the rapid recovery coil.

  • No corrosion risk with stainless steel.

  • Fitted with a high-quality Incoloy Immersion.

  • Enquire Now to Replace Your Old Cylinder with an Energy-Efficient Stainless Steel Cylinder!

Finding the Right Cylinder Size

The size of your hot water cylinder must match both demand and heat source. Consider the number of bedrooms, bathrooms, showers, and the heat source (gas, oil, solar, electricity).

Key Sizing Considerations:

Number of occupants
Number of bathrooms
Number of showers
Heat source (Gas, Oil, Solar, Electricity)
Cylinder Sizing Guide:

  • 2 Bedrooms, 1 Bathroom, 1 Shower: 96 Litre

  • 3 Bedrooms, 1 Bathroom, 1 Shower: 120 Litre

  • 4 Bedrooms, 1 Bathroom, 2 Showers: 140 Litre

  • 4 Bedrooms, 2 Bathrooms, 2 Showers: 160 - 300 Litre

  • Larger Properties, 2 Bathrooms, 3 Showers: 300 Litre

Understanding Hot Water Cylinders

A hot water cylinder, also known as a hot water tank, is essential for heating and storing hot water for showers, baths, and general use. Choose between unvented and open vented cylinders based on your heating arrangement and daily hot water needs.

Open Vented Hot Water Cylinders:

Usually made from copper or stainless steel.
Suitable for gravity-fed plumbing systems.
Pre-insulated for enhanced efficiency.
Affordable to install with minimal maintenance.

Unvented Hot Water Cylinders:

Made from high-grade stainless steel.
Suitable for pressurized plumbing systems.
Withstands high pressures, ensuring a satisfying user experience.
Safety features include temperature and pressure relief valves.

Direct Hot Water Cylinder:

Ideal for properties without gas or oil boiler heating systems.
Heated by an immersion heater, available in open vented and unvented models.

Indirect Hot Water Cylinder:

Features a heat exchanger or coil for external heat sources.
Can connect to gas, oil boilers, stoves, and solar panels.
Superior heat-up time compared to direct models.

Unvented Solar Hot Water Cylinder:

Suitable for open vented and unvented plumbing systems.
Sized according to solar hot water system heat output.
Ideal for maximum solar panel efficiency with a rapid recovery coil.

Thermal Store Cylinder:

Works opposite to standard cylinders, keeping water inside.
Suited for heat pumps and solar systems.
High flow rate for domestic hot water.
No need for pressure and temperature relief valves.

Make the smart choice by upgrading to energy efficiency with Stillorgan Gas. Our expert advice, top-notch products, and commitment to customer satisfaction make us your go-to partner for hot water cylinder solutions. Contact us now to embark on a journey towards a more efficient and cost-effective hot water system!

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