An 850kPa Expansion Control Valve, commonly known as an ECV, is an important valve used with compatible storage hot water systems during water heater installations and replacements.
The ECV is designed to help manage pressure created by water expansion inside the hot water system as the water heats. By allowing excess pressure to discharge safely when required, it helps protect the water heater, pipework, and connected plumbing components from unnecessary pressure stress.
This 850kPa expansion control valve is commonly used on mains pressure storage water heaters where an ECV is required as part of a compliant hot water installation. It is suitable for use with compatible electric, gas, and solar storage hot water systems, depending on the system requirements and local plumbing standards.
A reliable ECV helps support safe, practical, and long-term hot water system performance by assisting with pressure control during normal water heater operation.
Buying a new hot water system or hot water part should be simple. Hot Water Outlet helps you compare hot water systems, valves, thermostats, elements, pipework and fittings in one place, so you can choose the products that suit your home, budget and hot water needs without the back and forth.
Whether you already know exactly what you need or you are still comparing electric, gas, instant gas, gas storage or heat pump hot water options, Hot Water Outlet makes it easier to order with confidence.
Why Customers Choose Hot Water Outlet
Hot Water Systems and Parts in One Place
Shop hot water systems, valves, thermostats, elements, pipework and fittings online from one focused hot water store. Choose the system first, then add the parts and accessories needed for your setup.
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See your hot water system price upfront, then add common valves, fittings or accessories before placing your order. This makes it easier to plan your purchase and compare options before checkout.
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Key specs, sizing details, tank capacity, flow rate, gas type, energy source, dimensions, warranty information, product features and suitability notes are shown clearly, so you can compare hot water systems properly before you buy.
Valves and Accessories Available
Where relevant, you can add common hot water parts such as tempering valves, pressure relief valves, duo valves, non-return valves, thermostats, elements, pipework and fittings to help complete your order.
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Add your hot water unit and selected parts to cart in one order, instead of searching across multiple suppliers for systems, valves, fittings and accessories.
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Not sure which hot water system, size, energy type or accessory is right? Hot Water Outlet gives you a clearer way to compare electric hot water systems, heat pump hot water systems, gas storage hot water systems and instant gas hot water units before you order.
Designed To Make Your Decision Easier
Hot Water Outlet is built for customers who want a faster, clearer and more convenient way to buy hot water systems and hot water parts online.
Instead of guessing which product suits your home, searching multiple suppliers, or trying to match accessories separately, you can review the system, compare the specifications and add common hot water parts before checkout.
Choose your hot water system.
Add the valves and accessories you need.
Compare product details before checkout.
Order online with confidence.
It is a simpler way to buy the hot water products and parts that matter most.
Important Note
Product suitability can vary by property, existing services, energy source, gas type, available space, connection points, pressure requirements and local compliance requirements. Always check product specifications carefully and confirm the selected hot water system, valves, fittings and accessories are suitable for your property before ordering.
Standard Delivery: 2–8 business days
Express Delivery: 1–4 business days
90% of products are delivered the next business day where stock, postcode eligibility and freight availability allow.
Delivery timeframes are estimates and may vary by product, stock location, delivery postcode, carrier availability and order timing. Wet weather, storms, flooding or unsafe site access may delay delivery and are additional to any advertised or guaranteed freight timeframes.