Best Gravity Drainage in Baltimore MD

This company installed a water heater for a neighbor of mine and did a stroller job but after they had a problem with the heater they came out and looked at it and never came back to repair it, told her if it needed parts it would be around 400 dollars 25 days later they never came back or answered her phone calls. I looked at it and fixed it and the parts was covered under manufacturers warranty, I would absolutely not call this company for anything