At Mainline Plumbing, we specialize in gas water heater replacement in Londonderry, NH, as well as repair. By offering a wide range of residential water quality services such as service and installation of all makes and models of water heaters, we can handle all of your gas water heater needs without sacrificing the customer service you should expect.

With over 30 years of experience, we have you covered. Call us at (603) 686-7222 and we will respond to your issue quickly and efficiently. We can undertake any task, big and small, and complete it in the best way possible. It is our pleasure to fix any water heater problems or if you need a full water heater replacement.