The Gledhill Stainless ES 170L Direct Unvented Hot Water Cylinder is a competitively priced cylinder manufactured from a highly corrosion-resistant duplex stainless steel. Delivering mains pressure hot water the cylinder is electric only using twin immersion heaters to heat the water utilising off-peak electricity making the unit efficient with the benefit of a 40mm insulation to reduce heat loss. The cylinder is supplied with full NSF WRC and WRAS independent approvals.

Product Details:

  • Vertical direct unvented hot water cylinder
  • Delivers mains pressure hot water
  • High flow rates for showers and baths
  • 169 litre capacity
  • Heated directly by two 3kW incoloy immersion heaters
  • Suitable for use with economy electricity tariffs
  • Manufactured from highly corrosion-resistant duplex stainless steel
  • Manufactured using many recyclable materials
  • Quality manufacturing at a competitive price
  • Plain pipe connections suitable for use with compression fittings
  • 40mm HCFC/CFC free polyurethane foam insulation to reduce heat loss
  • Supplied with part G3 unvented kit
  • External expansion vessel
  • Supplied with full NSF and WRAS independent approvals
  • 25 year manufacturer guarantee - registration of cylinder required - T&Cs apply

Included in Package:

  • 19L Potable expansion vessel and wall bracket
  • Tundish
  • Combination inlet group including:
  • Pressure reducing valve
  • Strainer
  • Check valve
  • 22mm balance cold take off point
  • 15mm expansion relief valve
  • Expansion vessel hose connection point

Additional Information:

  • Delivery service only to mainland UK. Some post codes excluded.


£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

Cylinder Specification
Model Stainless ES
Type Direct
System Unvented
MPN SESINPDR170
Capacity (Litres) 169
Material Duplex Stainless Steel
Weight Empty (Kg) 24
Weight Full (Kg) 193
Diameter (mm) 530
Height (mm) 1131
Orientation Vertical
ErP Rating C
Heat Loss (watts) 57
Number of Immersions 2
Secondary Return No
V40 (Litres) 236
AEC 2763
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Gledhill Stainless ES 170L Direct Unvented Hot Water Cylinder

  • $615.03
  • (Delivery from $6.85 )
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
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