[header] How to repressurize a boiler [title] Turn off the power to the heating system. [step] After turning your boiler off, wait a few hours so it can cool. If you don't turn it off and allow it to cool before working on it, you could damage the system or hurt yourself. 
[substeps] If possible, wait 4 to 6 hours before working on the boiler after you turn it off. [title] Reach under the boiler and pull out the tray that is concealed underneath.