Telford hot water cylinders

Telford Copper & Stainless Cylinders Ltd is a British maker of hot water storage cylinders, based at Unit 22, Furrows Business Park, Haybridge, Telford TF1 2FE, and manufacturing in the UK¹. The company describes itself as making copper and stainless steel cylinders for over 35 years, and sells through the plumbing and heating trade rather than direct to households¹.

Its range covers vented and unvented cylinders in both copper and stainless steel, with indirect, direct, twin coil, renewable and pre-plumbed variants¹. Stainless vented stores run from 50 to 440 litres, and stainless unvented stores from 90 to 500 litres for indirect, direct, heat pump, solar and twin coil applications³. The stainless vented range carries a 10 year manufacturing warranty and the unvented range a lifetime warranty, both marked with conditions³.

For a household, the significance is straightforward. A cylinder is the part of a heating system that decides how much hot water is available, how fast it recovers, and whether a heat pump or solar thermal can be added later without replacing the store. Telford's renewable and twin coil variants exist for exactly that purpose, and the maker's own renewable coil is designed into the Tempest solar models⁵.

Telford Copper & Stainless Cylinders Ltd: who makes them and where

Telford Copper & Stainless Cylinders Ltd manufactures in the UK, and the company states that its stores are made in Britain, with over 35 years of manufacturing behind the range¹. The registered address on its datasheets is Unit 22, Furrows Business Park, Haybridge, Telford TF1 2FE, and the company website is telford-group.com².

The business positions itself as supplying the plumbing and heating industry, and states that its cylinders are available nationally through local plumbing or builders merchants¹. That trade route shapes everything else about buying one: there is no published direct sales channel to householders, and the merchant is the point of contact for ordering, delivery and warranty paperwork.

The maker's own description of the range is that it is the widest range of copper and stainless steel cylinders available, and that the cylinders are manufactured in the UK using premium quality materials¹. The Hurricane indirect cylinder is described as manufactured from Duplex stainless steel⁷, and the stainless unvented range as manufactured in the UK from premium quality Duplex stainless steel which provides superior corrosion resistance³.

Manufacturing location matters for a household in a way that is easy to overlook. A UK-built cylinder shortens the parts and service chain, and it means the maker's technical team and service engineers are domestic. Telford states that all its cylinders are supported by an in-house technical team and a national network of service engineers, available before, during or after purchase¹. That is a support claim rather than an independence claim: the cylinder still depends on a heat source, a merchant and, for unvented work, a competent installer.

The range: copper and stainless, vented and unvented

Telford's catalogue divides first by material and then by whether the store is open vented or unvented. The maker lists indirect, direct, twin coil, renewable and pre-plumbed options across the range¹. Vented cylinders are available in both copper and stainless steel, with a wide variety of sizes, types and capacities⁸. The stainless unvented range adds pre-plumbed, horizontal and slimline options, together with a competitively priced bespoke service with fast turnaround times³.

The two families behave differently in a home. A vented cylinder works with a feed and expansion tank, usually in a loft, and depends on gravity and a head of water. An unvented cylinder takes its supply directly from the mains and delivers hot water at mains pressure, which is why it needs a competent person to install and a discharge arrangement for the safety group. The choice is not a matter of quality but of what the property's existing system and mains supply can support.

The thermal store range is a separate product line. Telford's combination type store runs across 115, 135, 144, 160, 200, 250 and 300 litre capacities, and all stores come with a blend valve and shock arrestor factory fitted and a 3kW immersion as backup⁹. A thermal store holds heat in a body of water and transfers it to mains cold water through a heat exchanger, which is a different arrangement from a conventional cylinder and suits some heat pump and solid fuel combinations.

Stainless vented cylinders: 50 to 440 litres

The stainless vented range is the widest single family in the Telford catalogue, running from 50 to 440 litre capacities⁴. The cylinders are manufactured from Duplex stainless steel and are fully insulated with 35mm foam to minimise heat loss⁴. They are supplied with 22mm compression fittings, and the tappings are equivalent to the copper standard BS1566:2002 (Part L)⁴.

Several details in the specification matter to an installer. The cylinders come with 2 ¼ inch immersion heater bosses as standard, a secondary return fitted as standard under the IDF2 pattern code, and a choice of indirect, direct or twin coil configurations⁴. The finish is an attractive blue, with a white case available⁴. The maker also states that the range is suitable up to G2 specification⁴.

The Tempest range sits within the stainless family and adds model-level data. The Tempest indirect cylinders are listed at 125, 150, 170, 200, 250 and 300 litres, and the slimline indirect variants at 125, 150, 170 and 200 litres with a 470mm diameter¹⁰. The slimline models carry ErP ratings of C, while the horizontal indirect models at 250 and 300 litres carry a D rating¹¹. Those ratings are a label on standby loss and store behaviour, not a measure of how well the cylinder will perform in a particular house.

Indirect, direct, twin coil, renewable and pre-plumbed: which variant fits which system

The variant names describe what heats the water, and getting the match wrong is the most common way a cylinder purchase goes to waste. An indirect cylinder takes heat from a boiler or heat pump through a primary coil and does not heat water itself. A direct cylinder has no coil and relies on immersion heaters built into the store. A twin coil cylinder has two coils, so two heat sources can feed the same store, typically a boiler plus solar thermal or a heat pump plus a solid fuel stove.

Telford's thermal store price list sets out the design scope of each type in plain terms. The open vented store is designed for installations with vented heat sources and vented heating systems only. The open vented solar store with sealed boiler is designed for installations with vented solid fuel and heating systems as well as a sealed system boiler and solar. The sealed system with solar thermal store is designed for installations where there are no open vented heat sources and solar thermal is available. The electric-only store is designed for installations where electric is the only heat source available⁹.

The renewable variants carry a purpose-designed coil. The Tempest Indirect Solar and Tempest Direct Solar cylinders use Duplex stainless steel with an up to 0.71 square metre renewable coil, and are supplied with a factory-fitted 3kW immersion heater to provide back-up heat⁵. The vented indirect twin coil solar cylinder lists renewable and bespoke options¹². The Tempest Indirect S-Plan pre-plumbed cylinder arrives with 2x two port valves already fitted¹³.

Pre-plumbed cylinders are the variant that saves installation labour rather than improving performance. The pre-plumbed kit is fitted to the cylinder at the factory, so the installer connects to a prepared assembly instead of building the pipework and valve arrangement on site¹⁵. For a household, that usually means a shorter installation and less risk of a site-built wiring or valve error, at the cost of a cylinder that is less easy to reconfigure later.

Materials and corrosion resistance: duplex stainless steel versus copper

Telford's stainless cylinders are made from Duplex stainless steel, which the maker describes as providing superior corrosion resistance³. The same claim is repeated across the range: the Tempest solar cylinders are Duplex stainless steel⁵, the Lightning electric boiler package uses a Duplex stainless steel cylinder for the same reason¹⁶, and the Hurricane indirect cylinder is described as manufactured from Duplex stainless steel⁷.

Copper remains in the catalogue and has its own logic. Telford's renewables range is available in copper and stainless steel¹⁷, and the vented range is offered in both materials⁸. Copper is ductile, familiar to every plumber, and straightforward to modify on site. Stainless steel resists corrosion without relying on the water chemistry the way copper can, and it is the material the maker uses for its unvented and renewable lines.

The wider trade position is that both materials are standard. One bespoke cylinder maker lists copper and stainless steel as its two materials¹⁸, another manufactures bespoke cylinders up to 3,000 litres in copper with mild steel and stainless steel units available¹⁹, and a third operates a merchant-only policy on its bespoke copper cylinders²⁰. A standardised cylinder service elsewhere in the sector covers copper or stainless steel cylinders, vented and unvented cylinders that are heat pump and solar ready, heat pump buffer vessels from 8 to 100 litres, low loss headers, volumisers and high temperature header tanks²¹.

What this means for a household is that material choice is a specification decision, not a quality ranking. The relevant questions are what the water is like, what the heat source is, and whether the cylinder will be modified later. A cylinder that is never going to be altered and is fed by a heat pump or solar coil is a different proposition from one in a hard water area that may need reconfiguring.

Warranty: lifetime terms and the 10 year stainless manufacturing warranty

Telford's warranty structure is split by product family. The stainless vented hot water storage cylinders carry a 10 year manufacturing warranty⁴. The stainless unvented cylinders carry a lifetime warranty, and are available in capacities of 90 to 500 litres³. The company's own summary of the range refers to lifetime warranties across its cylinders¹.

Both headline terms carry asterisks on the maker's pages, which signals conditions attached to the period. The published pages do not set out those conditions in the material available here, and they do not separate the cylinder shell from the factory-fitted components such as immersion heaters and coils. That distinction matters, because immersion heaters are wearing parts and are commonly excluded or shortened in cylinder warranties across the sector.

For comparison, one rival unvented cylinder brand publishes a 30 year warranty on the inner tank for all its cylinders, covering any cylinder or calorifier installed in domestic properties²². That is a different structure from a lifetime term: a fixed 30 years on one component rather than an open-ended period on the cylinder.

The practical steps are the ones that apply to any cylinder: keep the merchant invoice, keep the benchmark logbook or commissioning record, and confirm with the merchant or the maker what registration the specific model requires. Telford's in-house technical team and national service engineer network are the stated route for support before, during or after purchase¹.

Bespoke cylinders for complex or individual requirements

Telford offers a bespoke service for complex or individual requirements, described as competitively priced with fast turnaround times¹. The stainless vented range lists bespoke options as available⁴, and the vented indirect twin coil solar cylinder lists renewable and bespoke options¹².

The bespoke market exists because standard cylinders do not fit every plant room, every heat source combination or every capacity requirement. Elsewhere in the sector, bespoke cylinder services cover copper and stainless steel¹⁸, twin coil cylinders can be ordered in bespoke sizes and specifications²⁰, and one maker manufactures bespoke cylinders up to 3,000 litres in copper with mild steel and stainless steel units available, alongside commercial cylinders up to 100,000 litres¹⁹. A standardised cylinder service covers heat pump buffer vessels from 8 to 100 litres, low loss headers, volumisers and high temperature header tanks as well as cylinders²¹.

For a household, bespoke work is usually triggered by one of three things: a heat pump installation that needs a larger coil or a buffer vessel than the standard range offers, a solid fuel or solar combination that needs a second coil in a specific position, or a space that will not take a stock cylinder. The trade-off is lead time and cost against fit. A bespoke cylinder is made to order, so the specification has to be settled before manufacture rather than adjusted on site.

UK availability, delivery and technical support

Telford cylinders are available nationally through local plumbing or builders merchants, and next day delivery is available¹. The maker supplies the plumbing and heating industry rather than householders directly, so the merchant is the ordering route and usually the first point of contact for a query¹.

Support runs through the maker. Telford states that all its cylinders are supported by an in-house technical team and a national network of service engineers, available before, during or after purchase¹. For a household, that means a technical question about coil size, tappings or a heat pump match can be answered by the maker even though the purchase went through a merchant.

The wider availability picture in the sector is that cylinders are a merchant product. One maker's indirect copper cylinders are available throughout the UK and Ireland from a named distributor²³, and another operates a strict merchant-only policy on bespoke copper work²⁰. Telford's own route is the same shape: national merchant distribution, with the maker behind it for specification and service.

On the independence question, a cylinder is a component rather than a system. It does not generate heat, and it does not reduce a household's dependence on a boiler, a heat pump, an immersion heater or a supplier. What a well-chosen cylinder does is make a change of heat source possible without replacing the store: a twin coil or renewable variant can take a solar thermal input or a heat pump coil now or later, and a pre-plumbed unit reduces the site work when that change happens. The dependence that remains is on the heat source, the merchant for parts, and the maker for warranty support. Households weighing a heat pump against a cylinder replacement can read more in hot water cylinders for heat pumps and heat pump sizing.