Copper & stainless · Fortic · Loft tank · Upgrade path

Vented Cylinder London

Vented (open-vent) hot water cylinder replacement, immersion element repair, header tank replacement, and full conversion to mains-pressure unvented. Traditional loft-fed and Fortic compact-format cylinders across every London borough.

Get a Cylinder Quote

Cylinder Quote

Vented cylinders: identify the system before choosing work

A conventional vented hot-water cylinder receives water from a cold-water cistern and has an open expansion route. Direct and indirect describe how it is heated, rather than whether it is vented. An integrated-cistern model has a different space requirement from a cylinder with a separate tank. Send the accessible model label and an overall photograph without removing covers or entering an unsafe loft.

The useful first decision is repair, suitable replacement or a wider conversion. An immersion or connection fault does not automatically condemn the vessel. A conversion should address a documented household need and be checked against the available supply, access and complete installation scope.

Range Cylinders’ Albion vented instructions illustrate separate and integrated feed arrangements and require a cylinder suitable for its heat source and working head. Gledhill’s vented and unvented comparison explains the supply distinction. These sources identify systems; they are not DIY installation instructions.

Confirm the competence and documents appropriate to the work before booking. England’s Approved Document G addresses hot-water safety. The government’s building-work guide explains notification and competent-person routes; do not assume that the word vented settles every compliance question.

Vented cylinder arrangements to identify

Indirect vented cylinder

Stored domestic water is heated through a coil connected to a compatible external heat source. The model, coil and existing controls must suit the proposed installation. A separate immersion may also be fitted; identify it before describing a loss of hot water.

Direct vented cylinder

An immersion heater heats the stored water directly. Check the actual element arrangement, timer and electrical supply when planning a replacement. A direct cylinder does not by itself establish which electricity tariff or heating schedule is appropriate.

Material and model specification

Record the current manufacturer, capacity and cylinder material. Choose a replacement against its documented application, dimensions and connections; do not assume that a different material automatically improves performance or suits every water supply.

Combination cylinder with integrated cistern

Some vented cylinders incorporate a feed cistern above the hot-water store, reducing the need for a separate cistern elsewhere. Fortic is a name you may encounter. Confirm the precise model, heat source and space needed for connections and servicing.

When to replace like-for-like

These questions help establish whether retaining the existing arrangement is suitable:

The existing arrangement meets your needs

If hot-water quantity and outlet performance were satisfactory before the fault, retaining the arrangement may be worth assessing. First establish whether the vessel needs replacement or whether a connection, control or heating component can be repaired.

You want to retain compatible equipment

A working boiler and controls may remain usable with a suitable indirect replacement. Their condition and compatibility still need checking. A retained boiler is not, by itself, a reason to rule out an unvented design.

You want to compare the complete project cost

Request a scoped like-for-like proposal and an alternative only where conversion is suitable. Include access, electrical work, controls, tank condition and disposal. Neither cylinder type is automatically the cheapest finished solution for every property.

Access or building constraints favour retention

Cupboard dimensions, loft access, shared services and restrictions on alterations can affect the design. In a listed property or managed block, establish required permissions before work. Do not assume either design bypasses all approvals.

When to upgrade to unvented

Discuss these design questions before deciding whether a conversion would meet your needs:

Outlet performance needs improvement

An unvented cylinder uses the incoming mains supply, but useful flow depends on the measured supply, distribution and simultaneous demand. Ask for those checks before accepting a promised shower improvement. No fixed pressure is guaranteed for every London address.

You want to remove a separate cold-water cistern

A conversion may allow removal of the cistern that feeds the cylinder. Confirm what else it supplies and how those connections will be dealt with. Removing one tank does not eliminate all water-leak risks or remove the need for maintenance.

A loft conversion changes the available space

Coordinate the hot-water design with the proposed building layout. Retention, relocation or conversion may each need consideration; a loft conversion does not automatically require unvented storage. Agree access, support and service routes before choosing equipment.

Household use is changing

Additional occupants, simultaneous showers or a bathroom renovation can change the required supply. Compare the actual usage pattern with a suitable design. Choose for that need rather than an unsupported promise that conversion increases the sale price.

Vented cylinder work: quote scope

AK’s £60 attendance fee covers the engineer coming to the property. Ordinary plumbing is £160 per hour; cylinder, conversion and electrical work need an agreed specialist scope and quote. AK is not VAT-registered, so no VAT is added. The attendance fee does not include diagnosis, parts or repair. See current charging information.

Scope	Price (no VAT added)	Confirm in the proposal
Indirect vented replacement	Quote after scope assessment	Cylinder specification, heat-source compatibility, controls, connections and access
Vented cylinder with a different material	Quote after scope assessment	Model suitability, dimensions, connections and manufacturer requirements
Direct electric vented replacement	Quote after scope assessment	Element arrangement, timer, electrical assessment and hot-water interruption
Combination cylinder replacement	Quote after scope assessment	Integrated cistern layout, capacity, access and associated connections
Vented-to-unvented conversion	Quote after scope assessment	Measured supply, safety and discharge design, controls, permissions and completion records
Cold-water cistern assessment or replacement	Quote after scope assessment	Condition, support, connected outlets, safe access and any required replacement
Immersion or control fault assessment	Quote after scope assessment	Diagnosis scope, electrical work, suitable parts and any drain-down or return visit

Illustrative cylinder planning scenarios

Planning example: compact electric flat

An owner wants to retain an integrated-cistern arrangement. The assessment would establish whether the complaint concerns the heater, controls or vessel, then check replacement dimensions and the existing electrical arrangement. This is an illustrative decision, not a completed AK job.

Planning example: retain an indirect system

A household is satisfied with its current hot-water supply but has a leak near the cylinder. Locating the actual escape comes before specifying replacement. If replacement is needed, the proposal should explain compatibility with retained equipment and the condition of the feed cistern.

Planning example: conversion during renovation

A loft project prompts consideration of unvented storage. Compare incoming flow, peak demand, available cylinder space, discharge routing and the services supplied by the old cistern. Agree the feasible design and full scope before authorising removal or ordering a cylinder.

Vented cylinder work across every London borough

Frequently asked questions

What is a vented cylinder and how is it different from unvented?

A conventional vented store is supplied from a cold-water cistern and has an open expansion route. An unvented store uses a mains-fed arrangement with specified safety controls. Neither label alone tells you the heating method or guarantees performance at a shower.

Should I replace like-for-like or consider unvented?

Start with the fault, existing performance, household demand and condition of the installation. Compare retaining a suitable arrangement with the complete conversion scope. An engineer should assess supply, access and compatibility before recommending equipment.

What is a Fortic cylinder?

The name is associated with combination cylinders incorporating a feed cistern above the hot-water store. Identify the exact product before choosing a replacement; capacity, heat source, connections and access all matter.

Can I retain an off-peak electricity arrangement?

Ask the assessor to check the cylinder, immersion elements, controls and actual supply or tariff arrangement together. A replacement does not automatically require a tariff change, but compatibility and scheduling must be confirmed. No particular controller or running-cost saving is promised.

How long will replacement take?

The appointment duration depends on the assessed scope, draining and refilling, access, related work and availability of the correct equipment. Ask for the expected interruption to hot water and whether a return visit is planned. We do not give a universal same-day completion promise.

What competence should I check before booking?

Ask for evidence relevant to the actual cylinder, water-supply and any electrical work. An unvented conversion needs appropriate competence and compliance arrangements. Confirm who will perform each part and what completion documents will be supplied.

Does an old loft tank automatically need replacing?

Age alone does not establish failure or a compulsory replacement date. Arrange assessment of its condition, support, fittings and connected services. Report an active leak or overflow promptly; do not enter an unsafe loft or disturb an unfamiliar valve.

Can I request urgent help for a cylinder fault?

AK offers 24/7 phone contact and emergency dispatch across Greater London. Describe the model, postcode, loss of hot water or escaping water. The available appointment, parts and repair scope must be confirmed; arrival and completion times are not guaranteed.

Can I check insurance and booking documents?

Ask for the current insurance evidence and terms applicable to the proposed work before booking. Keep the agreed scope, charging basis and any exclusions with the appointment details.

Does a vented replacement need Building Regulations notification?

Do not assume that every job is exempt because the cylinder is vented. Requirements depend on the actual work and applicable rules. Ask the installer to confirm the compliance and notification route before starting and consult building control if uncertain. A training certificate and a certificate for completed building work are different documents.

Book a vented cylinder replacement

Send your postcode, model and symptoms. Discuss repair, suitable replacement or conversion and confirm the specialist scope before booking.

Request a Quote