The proven XTherm - vertical modulating condensing boiler in sizes to 2000 MBTU. XTherm combines time-honored high-recovery copper fin technology with cutting-edge control and combustion advancements. The installer and building owner enjoy broad installation flexibility, easy commissioning, optimum seasonal efficiency, and long-term reliability.
Remarkably small footprint saves space for those cramped retrofit projects. Built to last, with industrial-grade construction and user-friendly serviceability. Extreme burner turndown produces up to 99% efficiency at low fire when it's most needed. Meets even 2012 LoNOx standards. Now is the time to take a closer look at Raypak's XTherm.
XTherm products take their jobs seriously. On the outside the muscular powder-coated steel cabinet provides clean proportions with a strong, unrivaled weather-resistant design. A look on the inside reveals the XTherm's hybrid heat exchanger system design. Our vertically-stacked and robust copper main heat exchanger delivers maximum non-condensing efficiency that works seamlessly with our new state-of-the-art stainless steel commercial-grade condensing heat exchanger. Maximum synergy is maintained throughout the complete XTherm heat exchange system with Raypak's proven Cold Water Protection System, a proven design approach that ensures the XTherm is built for even the longest days of work, while saving the maximum amount of energy every time it is used.
|Full Input in BTUH
- 96% efficiency at full fire. Condensing. Cat IV venting required.
- Cast-iron headers and pumps with copper finned-tube primary heat exchanger. Brass headers and cupro-nickel tubes available as options. CSA Low Lead Certified 0.25% Lead
- Minimum continuous inlet water temperature (50°F).
- Electronic modulating gas valve and burner, 7:1 turn down.
- Small footprint, less than 11 square feet.
- On-board diagnostic center, real English, no codes.
- All models indoor/outdoor construction.
- Complete cabinet protects all controls and wiring.
- Certified under SCAQMD rule 1146.2. Meets all Low NOx regulations.
- Suitable for altitudes up to 10,000 ft. (derate above 5,000 ft.).
- Primary-secondary piping required.
- 0-10 VDC Remote set-point BMS Interface.
- 0-10 VDC Direct Drive.
- Available for natural gas or propane.
- VERSA IC® control package with built-in outdoor reset function.
- Built-in cascade function for up to 4 boilers.
- Modbus® RTU port (RS485).
1. Low Voltage Wiring Terminal
- Outdoor air Sensor (B-32)
- Indirect DHW sensor
- 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)
- PVC vent factory installed only (D-32)
- Centrotherm® Polypropylene Vent Adapter (D-33)
- Condensate Neutralizer (Z-12)
Up front and easy to get to. Makes sensor wiring and
BMS wiring simple and clean.
2. Versa IC Board
The Versa IC, Integrated Control system is CSA listed
and certified as a combined temperature, safety, and
ignition control device. Easy front access to all field
wiring. This includes outdoor sensor, DHW sensor, system
alarm, Modbus BMS port and 0-10V DC input connections.
Each unit comes factory-equipped with cascade
control capability. Simple, quick access daisy
chain of up to 4 boilers, link to Raypak Temp Tracker
Mod+ Hybrid Master control for up to 16.
3. Control Interface
Large easy to read (3.5”) LCD display. Will continuously
monitor flame strength (μa) sensor temps, BMS
signal (0-10V) set points, delta-T, all safety signals, full
diagnostics and fault history for last 15 events.
Simple touch pad settings. Everything you need from
set-up to service is at your fingertips, all in one location.
4. Combustion Air Blower
Cast-aluminum, non-sparking construction. The stateof-the-art variable-speed blower is controlled by the onboard
Versa IC integrated controller and works in smooth
harmony with the main gas valve.
5. Dungs Gas Valve
The XTherm uses a state-of-the-art main gas valve
manufactured in Germany. This precision gas valve
works in perfect unison with the combustion air blower.
The result is silky smooth light-offs and a 7:1 turn
7. Vent Pressure Switch
Monitors vent pressure and provides safe shut down if back pressure is excessive.
8. Gas Inlet
The XTherm will operate at 100% full rate with gas
pressures as low as 4.0” w.c.
9. Water Outlet
With PRV and T & P gauge installed.
10. Boiler Pump
Sometimes referred to as the primary pump. This pump
keeps flow through the heat exchanger
11. Water Inlet
The XTherm can accept 50°F continuous inlet water
temperature and as low as 32°F during system startup.
12. Cold Water Protection
The XTherm comes factory equipped with a built-in
Cold Water Protection system. This advanced water control
system keeps the inlet water temperature to the
non-condensing heat exchanger above 120°F, regardless
of the incoming water temperature. It constantly
self-adjusts and regulates the incoming water flow
while still maintaining a constant delta-T in the heat
13. Flue Outlet
The stainless steel flue outlet is compatible with CAT IV
stainless steel. PVC or CPVC vent material may be used
in conjunction with the D-32 vent option on the
XTherm. Also available with option D-33 Polypropylene
vent material. Dramatically cut your installation costs by
using these non-metallic vent materials.
14. 316L Stainless Steel Condensing Heat Exchanger
Recovers waste heat to boost efficiency into 96%+
range. The XTherm utilizes a high-grade stainless steel
heat exchanger. This allows the corrosive combustion
condensate to be collected safely without damaging
the heater. There is a condensate disposal connection
on the rear of the heater. The XTherm is also equipped
with a condensate switch that will sense a blocked
condensate drain, which protects the heater.
16. Drain Valve
15. Vertical Non-Condesing Heat Exchanger
Cylindrical, multi-pass heat exchanger captures all
radiant energy, eliminating the need for
One of two drain valves located at the bottom of the
non-condensing heat exchanger. A third drain valve is
located on the condensing heat exchanger. This allows
for complete winterizing and drainage of the heater.
17. Viewing Port
Allows for easy burner inspection.
18. Weather-Proof Jacket
Heavy gauge galvanized steel with a UV-resistant
Polytuf powder coat finish is impervious to weather
Xtherm® Cold Water Protection System
Versa IC Boiler Control and On-Board Diagnostic Center
XTherm comes standard with a state-of-the-art Cold Water Protection System
factory-mounted and plumbed. Raypak's Cold Water Protection system provides
constant protection against condensation in the primary heat exchanger.
The system utilizes one or two variable-speed pumps, depending on model
size and type, to inject just the right amount of water from the main
system loop into the boiler to maintain the optimum inlet temperature.
This allows the full capacity of the boiler to be utilized to meet the
system load, while at the same time continuously maintaining the optimum
inlet water temperature to prevent condensation in the primary heat
exchanger. For models using the twin-pump design, each pump acts
independently giving the boiler up to a 10:1 flow turndown. All of this
keeps the condensate where it belongs, in the stainless steel secondary
The VERSA IC onboard control package merges safety, ignition and temperature control, outdoor reset and freeze protection, plus system monitoring, alarm and diagnostics,
and BMS transmission all in one Integrated Control Platform. Easy front access to read, set up and trouble shoot on a 3.5” LCD screen. The
entire package is CSA certified, and listed for each individual function.
Inlet and outlet sensors factory installed in boiler. Remote sensor for system included. BMS all point diagnostics transmission port. 0-10V DC
set point input standard. Also can drive and monitor external motorized auxiliaries such as extractors and louvers. Additional connections for
auxiliary functions such as indirect DHW, and dry contact remote alarm relay are provided.
• XTherm Basic Startup Video (EN)
• XTherm Vídeo Arranque Básico (SP)