How to Identify a Primatic Cylinder?

The bubble is compressed and changes position. If you have a cold water storage cistern, a hot water cylinder, and a boiler, but no feed and expansion tank or expansion vessel, it's quite possible that you have a primatic cylinder.

What is Primatic cylinder?

Single Feed (Primatic Cylinders)

Inside the cylinder is a baffle, which when filled, creates a trapped bubble of air. This air bubble separates the central heating water and domestic hot water. ... To reinstate the air bubble is simply a case of draining the central heating system down, and then refilling.

How do you drain a Primatic cylinder?

turn off the boiler and/or the immersion heater. close the cold feed to the cylinder and drain the system as normal. to re-fill, close the drain-off and open the cylinder cold feed and bleed the rads. DO NOT add any inhibitors or cleaning chemicals to the system.

Sarah Jenkins

Sarah Jenkins

Senior Technology Editor & AI Specialist

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.