Thermal Solutions has designed the high-efficiency copper-finned condensing Evolution® to meet the needs of today's commercial heating requirements. The Evolution EVCA design takes the very best of existing technology to the next level by incorporating a secondary heat exchanger. The result is higher efficiency and greater reliability in your application.

The Evolution is now being featured as a fully condensing boiler. Ranges are 750,000 through 3,000,000 BTU/hr. We offer the following features:

Infinite Modulation - Load Matching
The EVCA uses fuel/air ratio controls to modulate the firing rate, providing optimum performance and temperature control. There are no linkages or mechanical devices that can loosen during operation. It's the safest means of combustion control on the market.

Variable Water Flow Rates
Because of its condensing design, the EVCA has the flexibility to accommodate the variable flow rates and temperature requirements of today's diverse hydronic system designs.

Innovative Heat Exchanger Design
Central to the Evolution boiler's highly efficient operation is the design of its copper-tube heat exchanger. Not only does it efficiently maintain heat transfer, but the innovative gasketless header provides for easy inspection, cleaning and individual tube replacement. The specially designed condensing section is 100% stainless steel for maximum corrosion resistance and performance.

Clean and Efficient Advanced Combustion
Third-party certified to BTS-2000 at efficiencies up to 97% thermal and NOx ratings less than 9.9 ppm, the Evolution's noiseless ceramic radiant burner runs at minimal excess air levels, creating highly efficient, trouble-free operation. The rugged industrial cast-aluminum blower and fan wheel are equipped with a replaceable combustion air filter (99% efficient to one micron) to create excellent combustion characteristics and even air distribution. There's no need for tricky pressurized compartments…the Evolution boiler can even be operated with its jacket panels removed for easy inspection or maintenance.

Unique Timesaving Controls
Instead of using a series of relays, the Evolution design uses state-of-the-art microprocessor flame safeguard controls to provide extensive diagnostic information including first-out fault annunciation using an LED diagnostic display. The proven spark-to-pilot ignition system ensures that the pilot is lit before allowing the main gas valve to open. The optional display unit, shown at the left, can be easily incorporated to provide additional operational information and history.

Unmatched Operating Controls
The Thermal Solutions Boiler Control™ Module (TSBC™) is truly the heart of the Evolution condensing boilers. Operation is through simple menu selections and doesn't require special training or certification. The TSBC offers boiler pump control, outdoor reset, lead/lag operation, inlet and outlet temperature sensors, boiler operating history and many other functions to stand alone or facilitate integration with your existing heating controls or building management system. The TSBC provides warm weather shutdown and domestic hot water priority.
Unit of Measure



Dimensional Drawing for Evolution Condensing - 97% Ultra High Efficiency Hot Water Boilers

Input: BTUH

N/A 1,000,000 Btu/hr

Output: BTUH

N/A 939,000 Btu/hr

Ratings and Dimensional Data

MBH Input

N/A 1000 MBtu/hour

MBH Gross Output

N/A 939 MBtu/hour
Net Ratings, Water MBH1 N/A 817 MBtu/hour

Thermal Efficiency

N/A 93.9 %

Sq. Ft. per BHP

N/A 13.4 ft²

Width: "A"

N/A 28.25 in717.55 mm

Depth: "B"

N/A 54 in1372 mm

Height: "C"

N/A 65.188 in1656 mm

Gas Connection: "D" NPT

N/A 1-1/2 in

Water Inlet: "E" NPT

N/A 2-1/2 in

Water Outlet: "F" NPT

N/A 2 in

Air Inlet Connection: "G"

N/A 6 in152.4 mm

Vent Connection: "H"

N/A 6 in152.4 mm

Shipping Weight

N/A 1584 Pound

Ratings & Capacities


N/A 28.1 hp275 kW


N/A Natural Gas Propane

Input - High Fire

N/A 1,000,000 Btu/hr

Output - High Fire

N/A 939,000 Btu/hr

Inlet Gas Pressure (NG)

N/A 5 PSI Max. 7" W.C. Min.

Inlet Gas Pressure (LP)

N/A 2 PSI Max. 7" W.C. Min.

Operating Weight

N/A 1868 lb847 kg

Electrical Supply Options

Electrical Supply Options

N/A 120v/1ph/60hz - 12.8 Amps 208v/1ph/60hz - 9.1 Amps 208v/3ph/60hz - 7.4 Amps 230v/1ph/60hz - 9.0 Amps 230v/3ph/60hz - 7.3 Amps 460v/3ph/60hz - 6.3 Amps

ASME Design Data

ASME Design Data

N/A Max. 160 PSIG & 250ºF

Trim & Controls

Trim & Controls

N/A 3-Way Mixing Valve Blower Motor, 1-1/2 HP Combustion Air Switch Flame Safeguard High Temperature Limit High/Low Gas Press Switches LWCO Flow Switch Modulating Gas Valve Pilot Gas Regulator Pilot Gas Valve Pilot/Leak Test Cocks Pressure & Temperature Gauge Pump (internal), 1/4 HP Relief Valve Thermal Solutions Boiler Control (TSBC) VFD

Double Block & Bleed (D.B.& B.) Gas Train Option

Double Block & Bleed (D.B.& B.) Gas Train Option

N/A (1) Motorized & (1) Solenoid Gas Valves N.O. Vent Valve

D.B.& B. W/ P.O.C. Gas Train Option

IRI W/ P.O.C. Gas Train Option

N/A (2) Motorized Gas Valves with proof of closure switches Flame Safeguard that recognizes proof of closure valves N.O. Vent Valve



  • Efficiencies up to 97% (BTS-2000 Certified)
  • Ultra-low NOx levels below 9 ppm; meets or exceeds the most stringent emission requirements in the United States
  • CO less than 50 ppm
  • Quiet operation ( <50 dBA)
  • Maintenance-free ceramic radiant burner design
  • Gasketless header design; minimizes the potential for leaks
  • High quality copper-finned tubes extruded from solid copper piping; wall thickness is the best in the industry at 0.072"
  • Copper tubes are individually accessible for cleaning or inspection and replaceable to eliminate the need for whole heat exchanger replacement
  • Return water temperature as low as 50ºF with a maximum 50ºrT
  • Standard UL/FM/CSD-1 gas train; optional (2) Motorized Gas Valves with or without Proof of Closure and a N.O. Vent Valve
  • Single-point electrical hook-up for all voltage options (120-208-230/1/60 and 208-230-480/3/60)
  • Multiple relief valve settings (30, 50, 60, 75, 100, 125 and 150 psig)
  • Gas pressures range from 4" wc up to 5 psig
  • Infinitely proportional firing
  • Electric spark-to-pilot-ignition system
  • Aluminum non-sparking fan assembly
  • VFD air control; no dampers or linkages
  • Thermal Solutions Boiler Control (TSBC) offers advanced control features in a complete boiler monitoring and automation system
  • Inlet air filter 99% efficient to 1 micron
  • Non-proprietary parts
  • Jacket design lends itself to complete access to all components for easy serviceability
  • Quick-connect compact package; maximum footprint is 11 sq/ft
  • Sealed combustion or room air ready
  • Reduced stack sizes - multiple venting options: sealed, direct and conventional
  • Factory fire-test on every unit



cUL US, {H} Listed & US Green Building Council
  • 1 The NET AHRI Water Ratings shown are based on an allowance of 1.15".