What’s Inside a Boiler? - Part 2: Pressure Relief Valve If your boiler pressure keeps dropping, you keep topping it up, or you have water dripping outside from a copper pipe, the PRV is one of the key things to check properly. It is a safety device designed to protect your boiler and heating system from dangerous pressure levels, but once it has opened, it can sometimes fail to seal again. In this guide I’ll explain what the PRV does, why it activates, why it can start leaki

What’s Inside a Boiler? Series - By Terry Matthews Part 1: Expansion Vessel If your boiler pressure keeps dropping, swings up when the heating is on, or you’ve noticed water dripping from the copper pipe outside, the expansion vessel is one of the first things to suspect. It is a really common cause of pressure issues in combi and system boilers, and if it is left, it can trigger the PRV and put strain on other components. This guide explains what the expansion vessel is, wha