Gledhill Hot Water Cylinders: Which Range Is Right for Your Home?

If you’re choosing a new hot water cylinder, Gledhill is a popular UK choice for reliable performance across unvented, vented, thermal storage and renewable energy systems. This guide explains the key differences, how to pick direct vs indirect, and where each range fits best, with quick links to the right categories on TDL Online.

Quick links

Gledhill cylinder types at a glance

The first step is choosing the cylinder type that matches your system. Use the quick guide below, then jump to the relevant range.

  • Unvented cylinders: Mains pressure hot water for stronger showers and consistent flow.
  • Vented cylinders: Traditional hot water storage, typically fed from a cold water tank.
  • Thermal storage: High-performance hot water delivery via thermal store systems (often great for apartments).
  • Renewable energy: Cylinders optimised for solar thermal and heat pump systems.

Unvented cylinders: mains pressure hot water

If your home is on mains pressure and you want strong flow to taps and showers, an unvented cylinder is usually the go-to option. You’ll normally choose between indirect (boiler-fed via a coil) and direct (immersion heated).

Popular Gledhill unvented ranges

Browse the full unvented selection here: Gledhill Unvented Cylinders.

Direct vs indirect cylinders: what’s the difference?

The terms “direct” and “indirect” tell you how the stored hot water is heated:

  • Indirect cylinder: Heated by a boiler or heat source via an internal coil (often with immersion backup).
  • Direct cylinder: Heated by one or more electric immersion heaters (no boiler coil required).

Quick picks

  • If you have a boiler system, you’ll usually want an indirect model.
  • If you’re all-electric or need immersion-only heating, choose a direct model.

Handy links: ES Indirect | ES Direct

Space-saving cylinders: slimline & horizontal options

Tight airing cupboard? Low headroom? Gledhill offers options designed for awkward installations.

  • Slimline cylinders: Narrower diameter for compact cupboards. Shop slimline
  • Horizontal cylinders: Suitable where vertical space is limited (e.g., lofts). Shop horizontal

Renewable energy cylinders: solar & heat pump ready

If you’re running solar thermal or a heat pump, choose a cylinder designed to work efficiently with renewable heat sources. These models are often built to improve heat transfer and overall system performance.

Browse the full renewables range here: Gledhill Renewable Energy.

Thermal storage: PulsaCoil Stainless and more

Thermal storage systems can be a great option where you want strong hot water delivery and fast recovery. Gledhill’s thermal storage ranges are often chosen for apartments and modern heating setups.

Gledhill hot water cylinder FAQs

Which type of cylinder do I need: unvented or vented?

Choose unvented if you want mains pressure hot water and strong shower flow. Choose vented for traditional setups typically fed from a cold water storage tank. If you’re unsure, your installer can confirm what suits your system.

What size hot water cylinder should I choose?

Cylinder size depends on how many people live in the property, number of bathrooms, and typical hot water use. As a rough guide: 1–2 people (120–150L), 2–3 people (150–180L), 3–4 people (180–210L), 4–5+ people (210–300L).

What does direct vs indirect mean?

Indirect cylinders heat via a coil connected to a boiler/heat source. Direct cylinders heat via immersion heaters. Boiler-fed homes usually choose indirect.

What’s the difference between slimline and standard cylinders?

Slimline cylinders are designed with a narrower diameter for tight airing cupboards, while standard cylinders may offer a wider choice of dimensions depending on capacity.

Can I use a Gledhill cylinder with a heat pump or solar thermal?

Yes — but it’s best to choose a cylinder designed for renewables. Browse the Renewable Energy ranges for heat pump and solar options.

Where can I see the full Gledhill range?

Start here: Gledhill Cylinders at TDL Online. You can then filter by unvented, vented, thermal storage or renewable energy categories.

Shop Gledhill cylinders at TDL Online

Ready to choose? Use the links below to go straight to the right category:

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Gledhill Hot Water Cylinders: Which Range Is Right for Your Home?
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