Call us today at -- for a free estimate! If your pressure gauge has dropped to -bar, that doesn’t necessarily mean it’s faulty; that’s just as good an indication of a leak, as a faulty pressure gauge. Best of luck clearing up your drain and keeping it that way! Find out what central heating systems are available with this guide from uswitch decide what type of central heating system is best for your home. Ted was great! very professional and did a great job he gave.