Donamarc attended all the manufacturer presentations on VFD (Variable Frequency Drive) systems for residential applications in the late 1990s when VFD was first being sold in the residential market.    We waited and watched for the constant pressure pumping systems to prove themselves out.   In the year 2006, we felt comfortable that the manufactures of the day were proven and had worked the bugs out.  That very year we sold 50 constant pressure pumping systems and have sold thousands since.    VFD constant pressure pumping systems have proven to be very reliable.   The transducers which electronically monitor the water pressure and provide the computerized control the real-time pressure readings have proven to have a much lower failure rate than traditional pressure switches.   The controllers can also regulate incoming voltage so we have less failure in areas where we have voltage problems.   VFD systems can operate in a wider range of electric voltage than traditional pumping systems.

 

The biggest benefit of the VFD pumping systems for homes is that we can design a higher gallon per minute system without having larger or multiple pressure tanks.   Our most common design system is a 15 gallon per minute system operating at a constant 70 psi pressure.    

 

Having great pressure while taking a shower is only going to be as good as the weakest link in the system.    The traditional pumping system goes down to 40 psi before the pump turns back on.  With the standard constant pressure setup, the pressure maintains 70 psi while someone is taking a shower, even if someone is running the washing machine and flushing the toilet.    My own experience was when I was in my 2nd floor shower, while two other showers were being ran in the house, the washing machine was running, the dishwasher was operating, and someone had flushed the toilet.   Throughout my whole time in the shower, I couldn’t even tell someone else was in the house.   That’s what I love about constant pressure pumping systems!

 

If you have a modular home and you simply want to take advantage of the smaller footprint for space savings, or you have high water use such as a multi-head shower or a lawn irrigation system, or you simply love to take showers with great pressure, you will love the constant pressure pumping system.