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MVB Modulating Vertical Hydronic Boilers 504A-2004A

MVB Modulating Vertical Hydronic Boilers 504A-2004A

Time-honored technologies unite with cutting-edge advancements in Raypak’s MVB modulating vertical boiler. Small space is no longer a problem, and our compact design fits through a 32” door opening to make it the perfect choice for those hard-to-reach retrofit projects.


  • 84% Thermal Efficiency at Full Rate; Up to 88.4% at Part Load.
  • Negative vent pressure, non-condensing Appliance.  Cat I Vent Required.
  • Cast-Iron headers with copper finned tube heat exchanger standard. Brass Headers and Cupro-Nickel tubes available as options. ASME Section IV constructed and stamped, National Board registered.
  • CSA Low-Lead certified, less than 0.25% Lead.
  • Certified to ANSI Z21.13.
  • Minimum Inlet Water Temperature: 120°F.
  • Maximum Operable Outlet Water Temperature: 235°F.
  • Electronic Modulation, up to 1.7:1 Turndown.
  • VERSA IC® Control Package with Built-In Outdoor Reset Function and LCD Display, Including System Sensor, Indirect Sensor & Indirect Supply Sensor.
  • Status Display Lights.
  • Cascade control of up to 8 units, no external sequencer required.
  • Cascade in parallel or sequential modulation modes.
  • Diagnostics Center with History, English, no codes.
  • Modbus RTU BMS port (RS485).
  • 0-10 VDC BMS Interface (Setpoint or Direct Drive).
  • All models indoor/outdoor construction.
  • Certified under SCAQMD Rule 1146.2.  Meets all Low NOx regulations.
  • Engineered with precisely matched system components.
  • Smallest installed footprint (5.4 square feet) design fits tight spaces and easily replaces larger boilers.
  • 100% Factory Fire Tested.
  • Complete cabinet protects all controls and wiring. Tough, rust-resistant powder-coat finish.
  • Suitable for altitudes up to 10,000 ft. (derate above 2,000 ft.).
  • No boiler condensate drain required (proprietary design)
  • Available for natural gas or propane.
  • Integral Combustion Air Filter (MERV8).
  • Multiple Pump Outputs – Boiler Pump, System Pump, Indirect Pump.
  • Whisper-Quiet Operation.
  • Proudly Assembled in the USA.


  • Outdoor air Sensor (B-32)
  • BACNet IP, BACnet MS/TP, Modbus TCP, N2 Metasys (B-85)
  • Lonworks (B-86)
  • Alarm with 4” Bell (E-5)
  • Low Water Cutoff (F-10)
  • Cold Water Start (not for potable water systems)
  • Cold Water Run
  • Condensate Neutralizer (Z-12)
    • 84% Thermal efficiency at full rate 
    • 100% Factory fire-tested 
    • VERSA IC® modulating controller with 7" color touchscreen display 
    • Raymote™ remote connectivity provided standard 
    • Electronic modulation, 60% minimum fire 
    • Full safety diagnostics with history 
    • Status display lights 
    • Cascade up to 8 heaters - no external sequencer required 
    • Cascade in parallel or sequential modulation modes 
    • Modbus RTU BMS port 
    • Maximum outlet water temperature: 235°F (112°C) 
    • Minimum acceptable inlet water temperature: 120°F (49°C) 
    • Limited 20-year thermal shock warranty 
    • Limited 10-year heat exchanger warranty 
    • SCAQMD Rule 1146.2 certified, Low NOx < 20 ppm 
    • Proudly Assembled in the USA
Technical specification
  • Unique ref.MVB-Modulating-Vertical-Hydronic-Boilers-504A-2004A
  • Collection setBoilers & Water Heaters
  • CollectionHydronic Boilers
  • TypeObject (single object)
  • Date of publishing2020-10-01
  • Edition number1
  • BIMobject CategoryHVAC - Boilers
  • IFC classificationBoiler
  • UNSPSC nameBoilers
  • UNSPSC code401020
  • Uniclass 2015 CodePr_60_60_08
  • Uniclass 2015 DescriptionBoilers
  • CSI MasterFormat 2014 Code23 52 00
  • CSI MasterFormat 2014 TitleHeating Boilers
  • OmniClass TitleCommercial Boilers
  • OmniClass Number23-33 11 00
  • CSI UniFormat II CodeD3090
  • CSI UniFormat II TitleOther HVAC Systems & Equipment

Region availability

North America
United States