On the above models, some internal parts were made of plastic years of vibration means they are prone to cracking this is particularly the case around the diverter valve. Maintenance is key to keeping your water heater running safely, reliably, and efficiently. Blockages in pipes can be nasty, stopping waste from leaving your property you may have a blockage if. Find out about rubbish and recycling and keeping rushmoor clean. Boiler replacement grants are funded by the “big six” energy.