Add to basket. Check availability at a branch near you. Check stock. Only show branches with stock available now. Product details. Looking for a Worcester Bosch Pressure Relief Valve 87161064310? Order from Wolseley today - free delivery or click and collect available nationwide.. Attach the hose to each side of the valve and open the mains cold tap. Open the second tap which allows water in to the heating system. Watch the pressure rise and stop once the bar reaches just about one and turn off both taps. Remove the taps from the hose, there will be some water drip out so be mindfull.
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DISCLAIMER:This video is only intended for use by qualified Gas Safe Registered engineers. You must not attempt any work on your boiler if you are not qualif.. According to Worcester Bosch themselves, the ideal boiler pressure for a system that's off is between 1-1.5 bar. The boiler pressure should rise by about 0.3-0.5 bar when the boiler starts heating water, but should never rise above 2.75 or fall below 0.5 bar. How do I increase the pressure on my Worcester boiler? You can increase the boiler.
