The Thermal Solutions Evolution® Water Heater raises the standard by which other commercial water heaters shall be measured. The Evolution Water Heater combines a host of industry leading features along with an easy to service design that ensures long-term, dependable operation. And with the Thermal Solutions Products name behind it, you can trust the Evolution Water Heater to be a reliable, efficient source for hot water heating.

Serviceable Efficiency, Exceptional Heat Transfer
Thermal Solutions' innovative gasket-less bronze header allows access to individual tubes for inspection and cleaning by mechanical or chemical methods. It also allows for individual tube replacement, unlike the "disposable" type heat exchangers already on the market. The combustion chamber is completely enclosed in a stainless steel compartment that includes collection/evaporation components to effectively handle cold-start condensate.

Clean and Efficient, Advanced Combustion
Designed to operate with NOx ratings less than 10 ppm, the Evolution's ceramic radiant burner runs at minimal excess air levels creating clean burning, highly efficient, trouble-free operation. Our rugged industrial cast aluminum blower and fan wheel are equipped with a replaceable combustion air filter 99% efficient to one micron, creating excellent combustion characteristics with ensured even air distribution.

Troubleshooting, Timesaving Diagnostic Controls
State-of-the-art microprocessor flame safeguard controls provide extensive diagnostic information - including first out fault annunciation - using a LED diagnostic display. Each water heater undergoes complete factory fire testing to fully calibrate the fuel/air mixture to pre-set precise combustion set-up and operation.

Domestic Hot Water Sizing Requirements
Commercial buildings have different domestic hot water needs. The building type will be the major variable and the following chart shows the demand based on the fixture method.

Hard Working Quality. Built to Last.
Without question, the Evolution Water Heater is the most advanced, best-designed water heater on the market. Thermal Solutions designed the Evolution Water Heater to address the realities of today’s operational environment. You can trust the Evolution Water Heater to be your reliable, efficient source of hot water for years to come.

Packaged Water Heater Systems
Thermal Solutions also offers two types of factory-assembled Packaged Water Heater Systems: Direct and Indirect Systems. Each system includes a boiler or water heater, a vertical storage tank, pump, controls and all necessary components for a totally operational, skid mounted and factory certified package.

The ASME Section IV, Part HLW tanks are certified at 125 psi MAWP. They are available with a glass or epoxy lining and with or without jacketing & insulations.

The Direct System incorporates an EVAW bronze water heater with an all bronze pump, vertical storage tank, and controls. The Indirect System uses an EVA series boiler with a cast iron pump and a heat transfer tube bundle installed in the tank. This system features a closed loop operation with the water circulating between the boiler and the heat transfer bundle.

This fully assembled, pre-packaged equipment gives the owner and designer the ease and confidence of a single-source responsibility that meets their domestic water needs.

Which System Should Be Used?
When specifying or selecting a water heating system, it is important to consider the water in your area. If water quality is questionable or if the water hardness level is 8.5 grains or more, the Indirect System should be used. The Indirect System prevents any scale from building up on the inside of the boiler tubes when properly treated water is used. This keeps the system maintenance free and prolongs the life of the water heater.
Unit of Measure


Input: BTUH

N/A 1,500,000 Btu/hr

Output: BTUH

N/A 1,230,000 Btu/hr


Dimensional Drawing for Evolution - High Efficiency Water Heaters

Ratings & Capacities


N/A Natural Gas Propane

Input - High Fire

N/A 1,500,000 Btu/hr

Output - High Fire

N/A 1,230,000 Btu/hr


N/A 360 kW

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 1547 lb702 kg

Water Heater Dimensions

Dimension K

N/A 24 in

Dimension L

N/A 64 in

Dimension M

N/A 85 in

Gas Inlet N

N/A 1-1/2 in

Vent Outlet P

N/A 6 in

Electrical Supply Options

Electrical Supply Options (Modulating)

N/A 120v/1ph/60hz - 7.5 Amps 208v/1ph/60hz - 6.6 Amps 208v/3ph/60hz - 6.0 Amps 230v/1ph/60hz - 6.4 Amps 230v/3ph/60hz - 6.0 Amps 460v/3ph/60hz - 3.0 Amps

ASME Design Data

ASME Design Data

N/A Max. 160 PSIG & 250ºF

Trim & Controls

Trim & Controls

N/A 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 Operating Control Pilot Gas Regulator Pilot Gas Valve Pilot/Leak Test Cocks Pressure & Temperature Gauge Relief Valve 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 Valve 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



  • Ultra-low NOx levels below 10 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
  • Standard UL/FM/CSD-1 gas train; optional DB&B or IRI with POC gas train
  • 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 (Modulating models only)
  • Electric spark-to-pilot-ignition system
  • Aluminum non-sparking fan assembly
  • Bronze headers
  • VFD air control; no dampers or linkages (Modulating models only)
  • 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 6 sq/ft
  • Sealed combustion or room air ready
  • Reduced stack sizes - multiple venting options: sealed, direct and conventional
  • Factory fire-test on every unit

Packaged Systems


  • ASME Section IV, Part HLW tanks certified at 125 PSIG MAWP
  • Vertical or Horizontal tank design
  • Epoxy or glass tank lining available
  • Jacket and/or insulation available
  • Direct package systems include our water heater with an all bronze pump, tank, and controls
  • Indirect package systems include our boiler with a cast iron pump, heat transfer tube bundle installed in the tank and controls
  • Sole source responsibility - Equipment is prepiped, wired and mounted on bolted skids (unions in piping) for ease of installation



cUL US, {H} Listed

Ratings and Dimensional Data

Shipping Weight

N/A 1402 Pound