JAB DOV Direct Vented Cylinders (90L-200L)
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JAB DOV Direct Vented Cylinders (90L-200L)

JAB DOV Direct Vented Cylinders (90L-200L)

Select Size and Capacity
From $239.90

Original: $685.42

-65%
JAB DOV Direct Vented Cylinders (90L-200L)—

$685.42

$239.90

The Story

The JAB DOV Direct Vented cylinder is a stainless-steel replacement for traditional open-vented copper hot water cylinders, fed from a cold water storage cistern rather than mains pressure. Available in five capacities from 90L to 200L, each in a choice of Standard or Slim format, it's built from duplex stainless-steel and supplied with factory-fitted immersion heaters – twin 3kW elements on the 125L–200L sizes for multi-rate tariff flexibility. It is manufactured in Britain.

90–200L
Capacity Range
2
Formats: Standard / Slim
2 x 3kW*
Immersion (125–200L)
470–510mm
Diameter Range
25 Years
Cylinder Warranty
Vented
Cylinder Type
This is a vented cylinder, not unvented: it must be fed by gravity from a cold water storage (feed and expansion) cistern, typically in the loft, with an open vent pipe terminating over that cistern. It does not use the mains-pressure unvented kit, T&P relief valve, or expansion vessel found on JAB's unvented ranges.
Installer requirement: installation must be carried out by a competent person in accordance with the Water Regulations and Building Regulations, including correct sizing and positioning of the feed and expansion cistern and vent pipe.
Immersion configuration varies by size: the 90L model has a single 3kW immersion, while 125L–200L models are fitted with 2 x 3kW immersions and thermostats as standard for multi-rate tariff use. Confirm the correct model when ordering.
All electrical connections, including the immersion heater(s), must be wired by a qualified electrician in accordance with BS 7671; actual cable sizing should be calculated on site rather than assumed from generic figures.
Why Choose the JAB DOV Direct Vented
Direct Replacement for Copper Cylinders
Sized and configured to replace old grade 1–3 copper cylinders directly, so existing airing-cupboard pipework and fixings can usually be reused.
Twin Immersion for Multi-Rate Tariffs
The 2 x 3kW immersion heaters and thermostats fitted to the 125–200L sizes let the cylinder heat water on separate schedules, making it well suited to Economy 7 and similar multi-rate electricity tariffs.
Compact Diameter
At 470–510mm diameter, the cylinder is no larger than a standard 450mm foamed copper cylinder, so it drops into existing airing cupboards without rebuilding the space.
Standard or Slim Format
Every capacity is available as a standard-diameter or slimline cylinder at the same price, so the format can be chosen to suit the available cupboard width rather than height.
Duplex Stainless-Steel Construction
The duplex stainless-steel body resists pitting and stress corrosion far better than the mild steel used in older copper-jacketed cylinders.
25-Year Cylinder Warranty
Backed by a 25-year warranty on the cylinder itself, reflecting the expected service life of the stainless-steel vessel.
Sizes, Formats
Capacity Format Dimensions (H x D) Immersion
90L Standard 750 x 510mm 1 x 3kW
90L Slim 900 x 470mm 1 x 3kW
125L Standard 900 x 510mm 2 x 3kW
125L Slim 1050 x 470mm 2 x 3kW
150L Standard 1050 x 510mm 2 x 3kW
150L Slim 1200 x 470mm 2 x 3kW
170L Standard 1200 x 510mm 2 x 3kW
170L Slim 1500 x 470mm 2 x 3kW
200L Standard 1500 x 510mm 2 x 3kW
200L Slim 1800 x 470mm 2 x 3kW
Technical Specification
Construction
Cylinder Type Direct, vented (open-vented), duplex stainless-steel
Manufacture Made in Britain
Warranty 25 years on the cylinder
Connections
Cold Feed 1″ female iron (from feed & expansion cistern)
Hot Draw-Off 1″ female iron
Secondary Return / Shower Connection 1″ female iron
Electrical
Immersion Heaters (90L) 1 x 3kW
Immersion Heaters (125L–200L) 2 x 3kW with thermostats
Frequently Asked Questions
Is this a vented or unvented cylinder?
This is a vented (open-vented) cylinder, fed by gravity from a cold water storage cistern rather than direct from the mains. It is not interchangeable with JAB's unvented ranges, which require a completely different installation kit and mains-pressure feed.
Do I need a cold water storage cistern to install this?
Yes. As a vented cylinder it must be fed from a cold water storage (feed and expansion) cistern, typically in the loft, with an open vent pipe terminating over that cistern.
What's the difference between the Standard and Slim format?
Both hold the same capacity and cost the same; the Standard format uses a wider, shorter shell while the Slim format is narrower and taller, so the choice comes down to which best fits the available airing-cupboard footprint.
Is the 90L model the same as the rest of the range electrically?
No. The 90L model has a single 3kW immersion heater, while all other capacities (125L–200L) are fitted with 2 x 3kW immersion heaters and thermostats as standard.
Can this be used on an Economy 7 tariff?
Yes, the twin-immersion 125L–200L models are specifically suited to Economy 7 and similar multi-rate tariffs, with each element able to be scheduled independently.
Does this cylinder need a temperature and pressure relief valve?
No. As a vented cylinder it relies on the open vent pipe over the feed and expansion cistern for pressure relief rather than a mechanical T&P valve, which is specific to unvented systems.
JAB DOV Direct Vented Cylinders (90L-200L) - Image 2

Details & Craftsmanship

Every detail has been carefully considered to bring you the perfect product.

Description

The JAB DOV Direct Vented cylinder is a stainless-steel replacement for traditional open-vented copper hot water cylinders, fed from a cold water storage cistern rather than mains pressure. Available in five capacities from 90L to 200L, each in a choice of Standard or Slim format, it's built from duplex stainless-steel and supplied with factory-fitted immersion heaters – twin 3kW elements on the 125L–200L sizes for multi-rate tariff flexibility. It is manufactured in Britain.

90–200L
Capacity Range
2
Formats: Standard / Slim
2 x 3kW*
Immersion (125–200L)
470–510mm
Diameter Range
25 Years
Cylinder Warranty
Vented
Cylinder Type
This is a vented cylinder, not unvented: it must be fed by gravity from a cold water storage (feed and expansion) cistern, typically in the loft, with an open vent pipe terminating over that cistern. It does not use the mains-pressure unvented kit, T&P relief valve, or expansion vessel found on JAB's unvented ranges.
Installer requirement: installation must be carried out by a competent person in accordance with the Water Regulations and Building Regulations, including correct sizing and positioning of the feed and expansion cistern and vent pipe.
Immersion configuration varies by size: the 90L model has a single 3kW immersion, while 125L–200L models are fitted with 2 x 3kW immersions and thermostats as standard for multi-rate tariff use. Confirm the correct model when ordering.
All electrical connections, including the immersion heater(s), must be wired by a qualified electrician in accordance with BS 7671; actual cable sizing should be calculated on site rather than assumed from generic figures.
Why Choose the JAB DOV Direct Vented
Direct Replacement for Copper Cylinders
Sized and configured to replace old grade 1–3 copper cylinders directly, so existing airing-cupboard pipework and fixings can usually be reused.
Twin Immersion for Multi-Rate Tariffs
The 2 x 3kW immersion heaters and thermostats fitted to the 125–200L sizes let the cylinder heat water on separate schedules, making it well suited to Economy 7 and similar multi-rate electricity tariffs.
Compact Diameter
At 470–510mm diameter, the cylinder is no larger than a standard 450mm foamed copper cylinder, so it drops into existing airing cupboards without rebuilding the space.
Standard or Slim Format
Every capacity is available as a standard-diameter or slimline cylinder at the same price, so the format can be chosen to suit the available cupboard width rather than height.
Duplex Stainless-Steel Construction
The duplex stainless-steel body resists pitting and stress corrosion far better than the mild steel used in older copper-jacketed cylinders.
25-Year Cylinder Warranty
Backed by a 25-year warranty on the cylinder itself, reflecting the expected service life of the stainless-steel vessel.
Sizes, Formats
Capacity Format Dimensions (H x D) Immersion
90L Standard 750 x 510mm 1 x 3kW
90L Slim 900 x 470mm 1 x 3kW
125L Standard 900 x 510mm 2 x 3kW
125L Slim 1050 x 470mm 2 x 3kW
150L Standard 1050 x 510mm 2 x 3kW
150L Slim 1200 x 470mm 2 x 3kW
170L Standard 1200 x 510mm 2 x 3kW
170L Slim 1500 x 470mm 2 x 3kW
200L Standard 1500 x 510mm 2 x 3kW
200L Slim 1800 x 470mm 2 x 3kW
Technical Specification
Construction
Cylinder Type Direct, vented (open-vented), duplex stainless-steel
Manufacture Made in Britain
Warranty 25 years on the cylinder
Connections
Cold Feed 1″ female iron (from feed & expansion cistern)
Hot Draw-Off 1″ female iron
Secondary Return / Shower Connection 1″ female iron
Electrical
Immersion Heaters (90L) 1 x 3kW
Immersion Heaters (125L–200L) 2 x 3kW with thermostats
Frequently Asked Questions
Is this a vented or unvented cylinder?
This is a vented (open-vented) cylinder, fed by gravity from a cold water storage cistern rather than direct from the mains. It is not interchangeable with JAB's unvented ranges, which require a completely different installation kit and mains-pressure feed.
Do I need a cold water storage cistern to install this?
Yes. As a vented cylinder it must be fed from a cold water storage (feed and expansion) cistern, typically in the loft, with an open vent pipe terminating over that cistern.
What's the difference between the Standard and Slim format?
Both hold the same capacity and cost the same; the Standard format uses a wider, shorter shell while the Slim format is narrower and taller, so the choice comes down to which best fits the available airing-cupboard footprint.
Is the 90L model the same as the rest of the range electrically?
No. The 90L model has a single 3kW immersion heater, while all other capacities (125L–200L) are fitted with 2 x 3kW immersion heaters and thermostats as standard.
Can this be used on an Economy 7 tariff?
Yes, the twin-immersion 125L–200L models are specifically suited to Economy 7 and similar multi-rate tariffs, with each element able to be scheduled independently.
Does this cylinder need a temperature and pressure relief valve?
No. As a vented cylinder it relies on the open vent pipe over the feed and expansion cistern for pressure relief rather than a mechanical T&P valve, which is specific to unvented systems.
JAB DOV Direct Vented Cylinders (90L-200L) | AIZO Quality Heating