Technical advice
Technical advice, product developments, case studies and company news from World Heat.
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.
Read moreTechnical 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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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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Why approved unvented components matter
G3 Building Regulations, safety, and keeping the cylinder warranty valid.
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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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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.
Read moreTechnical advice
New TechTalk Series
Next month will see the introduction of our new TechTalk series here on our website.
Read moreThe in-depth guides, on heat pump cylinders, stratification, Legionella and the regulations, are gathered in Technical guides, and the calculators in Design tools.
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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.