Reliable Services

Serving Maryland, D.C., Northern Virginia, Delaware, West Virginia, & Pennsylvania

At STH Inc., we pride ourselves on delivering comprehensive pump solutions tailored to your needs. Our team of factory-certified technicians, dedicated service coordinators, and knowledgeable support staff are committed to ensuring optimal performance and reliability across all your pumping systems.

Product

Products

Explore our line card to see the industry-leading manufacturers we represent.

STH Flipbook Online

STH Flipbook Online

Browse our interactive product flipbook for a detailed look at the wide range of equipment and systems we service, from pumps to controls and beyond.

Comprehensive Services

Vertical Inline Fire Pump
Fire Pumps & Controllers
  • Repacking and repairs
  • Controller and transfer switch diagnostics
  • Motor replacement and repair
  • Flow management and failed pump analysis
  • Main relief valve repair
  • Water savings assessments
  • Preventative maintenance programs
  • Coupling replacement
Domestic Water Boosters
  • Pressure-reducing valve (PRV) rebuilds
  • Variable frequency drive (VFD) conversions
  • Hydro Tank bladder and full tank replacements
  • Control sequencing and troubleshooting
  • Mechanical seal, motor, and pump replacements
  • Preventative maintenance programs
HVAC Pumps
  • Pump and motor repairs or replacements
  • Mechanical seal and bearing replacements
  • Preventative maintenance programs
Water Filtration Systems
  • Point-of-entry and point-of-use systems
  • Cooling tower full flow, side stream, and sweeper systems
  • Legionella prevention strategies
  • Preventative maintenance programs
Sump, Sewage & Septic Systems
  • Pump and controller troubleshooting
  • Pump-down testing and analysis
  • Preventative maintenance programs
Laser Alignment

Laser Alignment

Precision alignment services for all pump types

Emergency Services

Emergency Services

Stock and rental pumps available for immediate needs

Water Usage Analysis & Energy Audits

Water Usage Analysis & Energy Audits

Comprehensive assessments for domestic water boosters, stormwater systems, and overall pump energy efficiency

Testing Rental Pump
Rental Pump Program

Minimize downtime with our versatile rental pump solutions:

Specifications

Available in 208- or 460-Volt configurations, delivering up to 120 GPM flow and 170 PSI pressure boost.

STH Services Include
  • Delivery and setup
  • Wiring of VFD controller using existing booster electrical feed
  • Programming VFD to match building requirements
  • Startup and commissioning
  • Deactivation and removal post-use
Client Responsibilities
  • Installation and integration into existing systems
  • Ensuring proper water quality to prevent mechanical seal failures
  • Removal of temporary pump and associated pipings
Note: Clients are responsible for any damages to rental components.