Insights
Technical advice, product developments, case studies and company news from World Heat.

Company news
World Heat wins Business of the Year at the Pride of Tameside Business Awards
We are delighted to share that World Heat has won Business of the Year at the Pride of Tameside Business Awards, presented by Tameside Metropolitan Borough.
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Technical advice
What makes a hot water cylinder right for a heat pump?
Not every hot water cylinder suits a heat pump. What to look for (coil size, coil pipe width and insulation) and what to ask your installer, in plain English.
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Technical advice
Stratification in commercial thermal stores and buffer vessels
How diffusers, sparge pipes and baffle plates keep thermal stores and buffer vessels stratified, why CO₂ heat pumps need a cold return, and what CIBSE CP1 says.
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Technical advice
Legionella control and safe hot water storage
Legionella control for stored hot water: HSE L8 and HSG274 temperatures, dead legs, thermal disinfection, and how heat pump cylinders reach storage temperature.
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Company news
Live lead times now on our product pages
Our product pages now show live lead times for our standard domestic and pre-plumbed cylinders, updated throughout the day, so you can plan the job before you pick up the phone.
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Company news
Chat to our team live on the website
You can now chat live with our technical sales team from any page on our website. Real people, the same team you'd speak to on the phone.
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Company news
Report a cylinder fault from your phone
If a World Heat cylinder has a problem you can now report it online, with photos, straight from your phone, so our technical team can work out the fix before we call you back.
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Company news
Register your cylinder warranty online, on site
Our warranty registration form has been rebuilt so installers and homeowners can register a new World Heat cylinder from a phone in a couple of minutes.
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Company news
Add your own logo to our spec sheets
Installers and merchants can now download any World Heat spec sheet with their own company logo added, ready to send on to their customer.
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Company news
New tool: what would a new cylinder save?
Our insulation savings calculator shows building managers and specifiers how much a World Heat foam-insulated cylinder could save each year compared with an existing commercial vessel.
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Company news
New tool: hot water storage sizing
Our hot water storage sizing calculator works out storage volume and reheat time together, for homes and for commercial buildings, with the method and every assumption shown.
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Company news
New tool: find a replacement for an existing cylinder
Tell us about the cylinder that's there now and our replacement tool shows the World Heat cylinder to replace it with, and whether it's a straight swap.
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Company news
New tool: which cylinder for this heat pump?
Our heat pump cylinder tool takes the home and the heat pump and shows the World Heat cylinder to fit it, a size either side, and whether the coil suits the heat pump.
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Company news
New tool: will it fit? Our cylinder space checker
Measure the cupboard, answer two questions and our space checker shows every World Heat cylinder that fits, with the spare millimetres on each side.
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Company news
Introducing our pre-plumbed heat pump cylinder selector
Start with the heat pump and our pre-plumbed selector points you to the World Heat pre-plumbed package that suits it, with the product information sheets and a quote request filled in.
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Company news
Every domestic cylinder in one table
Our domestic cylinder quick reference puts every model's capacity, height, diameter and heat loss in one table that you can filter, print and share.
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Company news
Find the right cylinder in three questions
Our new cylinder finder asks three simple questions, about the heat source, the size of the home and the space you have, and shows the World Heat domestic cylinders that suit.
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Company news
All our manuals and datasheets in one downloads library
Our new downloads library has the installation and O&M manuals and datasheets for our cylinders, calorifiers and buffer vessels, by product, free to download with no login.
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Company news
Request a quote online in a few quick steps
Our new online quote form asks a few quick questions about the cylinder, calorifier or buffer vessel you need and sends them straight to our team at the factory.
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Technical advice
Choosing the right domestic hot water cylinder
What to weigh up: household size, hot water demand, your heating system and the space available.
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Technical advice
The advantages of unvented hot water systems
Mains-pressure hot water to several outlets at once, with no cold water tank in the loft.
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Technical advice
When a vented cylinder is the right choice
Gravity-fed systems, replacing old copper cylinders, and why stainless steel suits hard water areas.
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Technical advice
What a thermal store does
How a thermal store stores heat from one or more sources and delivers mains-pressure hot water.
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Technical advice
Horizontal cylinders for restricted height
Where a horizontal unvented cylinder makes sense: lofts, eaves and anywhere height is restricted.
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Technical advice
Cylinders engineered for heat pumps
Why heat pump cylinders need larger coils and the right flow rates to work efficiently.
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Technical advice
Twin coil cylinders for two heat sources
Combining a boiler with solar thermal or a heat pump in one cylinder.
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Technical advice
Why install a buffer vessel
Adding system volume to stop heat pumps, boilers and chillers short cycling.
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Technical advice
Why use a low loss header
Keeping flow through the heat source within its design conditions by separating primary and secondary circuits.
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Technical advice
What’s in an unvented cylinder kit
The inlet control group, expansion vessel, T&P valve and tundish, and what each one does.
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Technical advice
Why approved unvented components matter
G3 Building Regulations, safety, and keeping the cylinder warranty valid.
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Technical advice
Calorifier manufacturing standards
BS 853, PD 5500 and the Pressure Equipment Directive, and when each applies.
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Technical advice
Gasketed vs brazed plate heat exchangers
How the two types are built, and where each is the better fit.
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Technical advice
Cylinder and calorifier insulation options
Injection-insulated steel casings, foam spray insulation and cased polyurethane finishes compared.
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Company news
World Heat Cylinders recognised in Innovation 100: Greater Manchester
A hundred of Greater Manchester's most innovative businesses have been recognised with the publication of the first Innovation 100 Report.
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Technical advice
TechTalk 1: Corrosion of Cylinders
We kick off our new TechTalk Series with the topic “Corrosion of Cylinders” and make you aware of our “Technical Literature” section here on our website.
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Technical advice
New TechTalk Series
Next month will see the introduction of our new TechTalk series here on our website.
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Case studies
Plate Heat Exchanger Packages Heading to Headingly
World Heat Cylinders are proud to reveal our new range of Commercial Plate Heat Exchanger Packages!
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Case studies
Headingley Stadium redevelopment
Two bespoke 420 kW plate heat exchanger packages providing instantaneous hot water for the rugby and cricket stadiums.
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Oil Cooler Heat Exchanger Manufactured
World Heat Cylinders have recently manufactured a replacement oil cooler for use on an oil rig in the Irish Sea.
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Need a cylinder built to your specification?
From 10 litres to 10,000 litres, our Manchester team designs, manufactures and tests every vessel in-house. We confirm and respond to every bespoke enquiry within 48 hours, and standard range enquiries immediately. If you need a price on a standard product, don’t hesitate to call and speak to one of our team on 0161 343 8610.We confirm and respond to every bespoke enquiry within 48 hours, and standard range enquiries immediately. If you need a price on a standard product, don’t hesitate to call and speak to one of our team on 0161 343 8610.We confirm and respond to every bespoke enquiry within 48 hours, and standard range enquiries immediately. If you need a price on a standard product, don’t hesitate to call and speak to one of our team on 0161 343 8610.
