Find out how we generate enough energy to power 1 million homes. Would they have to use the manhole to do the survey? i needed my drains to be checked, and they couldn't even find a manhole (they think it might have been tarmacked over by a previous owner. All potterton products are supported by the baxi customer support team who are on hand to provide you with more information. This is actually a bit more complicated (annoyingly) than standard procedures when companies go bust.