Davey EvoDrive Constant Pressure Pump

EvoDrive is the drive-controlled member of the Davey range. A variable speed drive modulates motor speed to hold one outlet pressure as demand changes, and a permanent magnet motor running to 5,200 rpm does that quietly and at low energy. The illuminated touch panel shows operating pressure and set pressure side by side and raises on-screen fault alerts.

Davey specifies it for domestic boosting in medium-sized homes and for light commercial work — cafés, small offices, retail. It will pressurize from the city main, pump clean water from a below-ground storage tank, support a reverse osmosis system, run lawn and turf irrigation, or work with a pressurized well tank on a 40/60 psi cut-in/cut-out arrangement.

Davey publishes what that means in faucets: from a well or rainwater tank at a 60 psi setting it delivers 10.5 gpm, around five faucets. Boosting a 35 psi city main at the same setting it delivers 21 gpm, around ten faucets, based on 2.2 gpm average per outlet running at once.

Two EvoDrive units pair from a single connection cable for duty/standby or parallel operation. In normal running the pair alternate cycles so the load is shared, and at peak demand the controller combines their output for more flow. There is no programming to do — one cable, and the system works out the rest. The connection cable is sold separately.

Two pumps also hold more pressure at the flow the building actually draws. Each carries half the water, so each sits higher on its own curve: 22 gpm from one unit comes out at 20 psi, while the same 22 gpm split between a pair is 11 gpm each and comes out nearer 58 psi. The figure that does not rise is the maximum pressure, fixed at 95 psi by the pump.

Two-pump figures are read from the published single-pump duty points at the flow each pump carries. Davey publishes no combined performance table for paired EvoDrive.

Davey tabulates EvoDrive as flow at stated pressures, so the figures below are the manufacturer’s own rather than a reading off a plot.

Pressure added at flow, from the Davey EvoDrive curve:

ED16-40NPT — 95 psi maximum boost

Drawing from a tank or below-ground storage — nothing arrives with pressure, so what the pump makes is what you get. At the 60 psi factory setting that is 10.5 gpm, which Davey puts at about five faucets running together.

Fed by a city main — the drive holds your setting and only makes up the difference. Davey publishes the same pump at the same 60 psi setting delivering 21 gpm on a 35 psi main, about ten faucets, against 10.5 gpm from a tank. Incoming pressure buys you more flow, not more pressure.

Best operating range: 16 gpm at 40 psi. This is where the pump turns the most electricity into water pressure. Ask for more flow than it can deliver at your setting and it runs at full speed continuously, which is where motors and seals wear out. Sizing a booster to the building rather than to the headline numbers is what makes it last.

Zero flow is the maximum pressure — a ceiling, not a working point. Duty points are tabulated by Davey in datasheet DWP3267-1/1025 and reproduced unchanged. The best efficiency point is published by Davey, not derived. Faucet figures are Davey’s, based on 2.2 gpm average per outlet running simultaneously.

This pump has no app or remote connectivity. It runs from the illuminated touch panel on the unit, which displays operating pressure, set pressure and fault alerts, and needs no network connection.