Gledhill ES 170L Direct Unvented Cylinder: Complete Buyer’s Guide
Gledhill ES 170L Direct Unvented Cylinder: Complete Buyer’s Guide
The Gledhill ES 170L Direct Unvented Cylinder provides reliable mains-pressure hot water for family homes, larger flats and properties without a suitable boiler connection.
View the Gledhill ES 170L Direct Cylinder
Two 3kW immersion heaters heat the stored water using electricity. Therefore, the cylinder is ideal for an all-electric property or any home that requires a direct hot water system.
Gledhill manufactures the inner vessel from highly corrosion-resistant duplex stainless steel. In addition, effective insulation helps retain heat and reduce standing heat loss.
Please note: Delivery of this cylinder is available to Mainland England addresses only.
What Is the Gledhill ES 170L Direct Cylinder?
The Gledhill Stainless ES 170L Direct is an unvented hot water cylinder with the model number SESINPDR170. Although Gledhill identifies it as a 170-litre model, the latest manufacturer technical manual lists a total water capacity of approximately 161 litres.
Because it is a direct cylinder, electric immersion heaters provide the main source of heat. It does not contain a primary heating coil for connection to a gas or oil boiler.
Meanwhile, its unvented design connects directly to the incoming mains water supply. As a result, the system does not require a traditional cold-water storage tank in the loft.
Main Features and Benefits
Mains-Pressure Hot Water
Supplies hot water directly from the mains for strong flow at suitable showers, baths and taps.
Electric Water Heating
Two 3kW immersion heaters make it suitable for properties without a boiler-fed hot water system.
Duplex Stainless Steel
The corrosion-resistant stainless steel vessel provides strength, durability and dependable service.
No Loft Storage Tank
An unvented system removes the need for a traditional cold-water tank in the loft.
Gledhill ES 170L Direct Technical Specification
| Specification | Details |
|---|---|
| Manufacturer | Gledhill |
| Range | Stainless ES |
| Model number | SESINPDR170 |
| Cylinder type | Direct unvented |
| Nominal model size | 170 litres |
| Actual total capacity | Approximately 161 litres |
| Immersion heaters | 2 x 3kW |
| Inner vessel | Duplex stainless steel |
| Energy efficiency class | C |
| Standing heat loss | 1.37kWh per 24 hours |
| Operating pressure | 3 bar |
| Height | 1130mm |
| Diameter | 530mm |
| Empty/full weight | Approximately 24kg / 193kg |
| Expansion vessel | 19 litres |
Specifications should always be checked against the latest Gledhill technical manual before installation.
How Does a Direct Unvented Cylinder Work?
A direct cylinder uses immersion heaters inside the vessel to heat the stored water. The Gledhill ES 170L Direct has two 3kW heaters, which installers can normally arrange for on-peak and off-peak operation.
This arrangement may allow households with a suitable electricity tariff to heat most of their water during cheaper off-peak periods. The upper immersion heater can then provide additional hot water when required.
However, electricity tariffs and household usage vary. Therefore, customers should compare energy costs and obtain professional advice before choosing their heating arrangement.
Who Is the Gledhill ES 170L Direct Suitable For?
The Gledhill ES 170L Direct Unvented Cylinder may suit:
- Medium-sized family homes
- Larger flats and apartments
- Properties without a gas supply
- Homes without a suitable boiler connection
- Households with moderate to higher hot water demand
- Properties using an off-peak electricity tariff
- Replacement electric cylinder installations
Actual suitability depends on how much hot water the household uses. For example, large baths, powerful showers and several people using hot water close together can increase the required capacity.
Is 170 Litres Large Enough?
A cylinder in this size range can often serve a typical family home. However, choosing a cylinder based only on the number of bedrooms may lead to poor results.
Your installer should consider:
- The number of occupants
- The number of bathrooms and showers
- The volume of any baths
- Whether outlets will run at the same time
- The incoming mains water pressure and flow
- The time available to reheat the water
- Available space for the cylinder and components
If the cylinder is too small, the household may run out of hot water during busy periods. In contrast, an unnecessarily large cylinder can cost more to purchase and heat.
Mains Water Requirements
An unvented cylinder can only deliver the water supplied to it. Therefore, good incoming mains pressure and flow are essential.
Gledhill advises that optimum performance requires approximately 3 bar dynamic inlet pressure and 30 litres per minute of incoming flow. The cylinder can work below these figures, but outlet performance may fall.
A qualified installer should test the supply before recommending or installing the cylinder. This check becomes especially important when several showers, baths or taps may operate together.
What Comes with the Cylinder?
The Gledhill Stainless ES package normally includes the main components required for an unvented installation:
- Gledhill Stainless ES 170L cylinder
- Two 3kW immersion heaters
- Combination inlet control group
- Pressure-reducing valve
- Expansion relief valve
- Temperature and pressure relief valve
- 19-litre potable expansion vessel
- Expansion vessel wall bracket
- Tundish
- Technical and user literature
The installer may need additional fittings, controls and discharge pipework to suit the property. Package contents can also change, so check the latest product literature before installation.
Why Choose the Gledhill Stainless ES Range?
Gledhill designed the Stainless ES range to provide dependable performance at a competitive price. It combines proven unvented-cylinder technology with a strong duplex stainless steel vessel.
Key reasons to choose the range include:
- Competitive price compared with many premium cylinders
- Corrosion-resistant duplex stainless steel construction
- Direct connection to the mains water supply
- No cold-water storage tank required
- WRAS and NSF WRC independent approvals
- Direct and indirect models available
- Several cylinder sizes across the range
- Components supplied to support installation
- Established UK cylinder manufacturer
Why Buy from SNH Tradecentre?
- Competitive online prices
- Established plumbing and heating merchant
- Knowledge of the Gledhill cylinder range
- Helpful advice before you place your order
- Secure online ordering
- Mainland England delivery
SNH Tradecentre supplies Gledhill cylinders to homeowners, landlords, installers and trade customers. If you are unsure which model you need, contact our team before ordering.
Frequently Asked Questions
Does the Gledhill ES 170L Direct need a boiler?
No. Two electric immersion heaters heat the water, so the cylinder does not require a boiler-fed heating coil.
Does it provide mains-pressure hot water?
Yes. The cylinder connects directly to the cold-water mains. However, actual outlet performance depends on the incoming pressure, flow rate and pipework.
How many immersion heaters does it have?
The SESINPDR170 has two 3kW immersion heaters, normally arranged for lower off-peak heating and upper on-peak top-up heating.
What is the actual capacity?
Gledhill’s current technical manual lists a total capacity of approximately 161 litres. The product belongs to the manufacturer’s nominal 170L size category.
Can I install the cylinder myself?
No. An unvented cylinder must be installed and commissioned by a suitably qualified engineer who holds the appropriate G3 qualification. The installation must comply with current Building Regulations and the manufacturer’s instructions.
Order the Gledhill ES 170L Direct Cylinder
The Gledhill ES 170L Direct Unvented Cylinder Stainless Steel offers a practical solution for electrically heated mains-pressure hot water. Its duplex stainless steel construction, twin 3kW immersion heaters and supplied installation components make it a strong-value choice for suitable family homes.
Always ask a qualified installer to confirm the required cylinder type, size and available mains-water performance before ordering.