San Francisco’s Top-Rated
Plumbing Company

Launched in 2011 by Alan Moran and Fergal McMahon, Flow Masters Plumbing has earned a reputation among contractors, architects, commercial and residential clients for the uncompromising quality of their work.

“We love challenges.”  —Alan Moran, co-owner

Flow Masters Plumbing team photo

Award-Winning Plumbing Solutions

Flow Masters applies the same high standards to fixing a leaky faucet or overflowing toilet as they do to designing and installing radiant heating or a boiler room.

Their work was awarded first and second place in a worldwide competition sponsored by Lochinvar®, a major boiler manufacturer. In 2020, Flow Masters was selected as designated plumbers for the prestigious San Francisco Decorator Showcase House.

FMP co-owners Alan Moran and Fergal McMahon
Fergal McMahon (L) & Alan Moran (R)


The Flow Masters partners arrived in San Francisco from Ireland in the late 90s. Fergal had worked with his dad, a plumber, since he was a young lad. Alan learned the trade while working at a San Francisco plumbing company where the two met. Eventually, they decided to form their own company.

With a few good clients on board, Flow Masters Plumbing was off and running. Soon word spread about the partners’ commitment to delivering value, and the business grew exponentially. Flow Masters Plumbing is a member of several Bay Area plumbing associations. Fergal serves on the board of the SFPHCC (Plumbing-Heating-Cooling Contractors of San Francisco.)


Fergal and Alan believe the best employee is the one you already have. That’s why they invest in training opportunities for their team. They regularly host manufacturer-led seminars and other continuing education. And, if any employee expresses an interest in a trade outside their normal tasks, the principals will help them explore any area they wish to pursue


What’s the difference between a boiler and a water heater?

A water heater typically is a large tank that stores water in the basement, garage, or other areas of your home. It uses gas or electricity to heat the water and keep it at the proper temperature. These units are outdated. In many areas gas-powered water heaters are being phased out and replaced by electric powered units.

A boiler is a complex appliance that can rapidly heat water. Where older models are energy hungry, noisy and lacked efficiency modern boilers are sophisticated, more efficient and feature cutting edge technology. FMP is one of the few Bay Area plumbing contractors to specialize in the installation and maintenance of this type of advanced equipment.

What is a heat pump?

Hydronic (air to water) heat pumps are the future of home heating and cooling. Heat pumps are alternatives to forced air furnaces & A/C that are affordable, environmentally friendly and efficient. You can save money on monthly utility bills while also enjoying a more comfortable home. Hydronic heat pumps will draw heat energy from the outdoors and use it to heat water before sending the warm water through tubing in the ceilings or walls. The bay area has the perfect climate to get the most efficiency from a heat pump. With the latest innovations the right system can both heat & cool your home plus help with the domestic hot water demands.

What are the benefits of radiant heating?

Comfort, convenience, clean and green. Radiant heating is more energy efficient than forced air or baseboard heat. No ductwork means that dust and other allergens won’t circulate via air vents in your house, bringing relief to allergy sufferers. But perhaps the best part — radiant heating means warm floors and warm feet, 24/7

Is radiant or hydronic cooling the same as air conditioning?

No. Radiant cooling is quiet, dust-free, and energy-efficient. Unlike A/C, radiant cooling systems pump water through a system of tubing in the ceilings or walls instead of using fans, so you won’t feel cold air blowing on you. Room temperatures stay consistently cool and comfortable. The comfort level the homeowner feels is unmatched. This same system can be reversed to also heat your home. This is all achieved by the use of a hydronic (Air to water) heat pump

How often should backflow testing be done?

In most counties yearly testing is mandatory. Typically the city or county sends a notification to remind property owners when to have the test performed. Schedule your yearly inspection with FMP to remain compliant.

What if I have a plumbing emergency at night or on a weekend?

No worries! If it can’t wait for the next morning or Monday, call us and we will dispatch a technician to your home. Weekend and evening rates are a little higher than regular daytime rates.

Awards & Affiliations