DC 20-125

DC 33-160

Dual Fired Combi - Unique 2 in 1 heat exchanger eliminates the need for a Diverter valve and plate type heat exchanger.

· Up to 96% AFUE with full ASME-rated vessel.
· Two independent copper coils embedded in a cast aluminium heat exchanger.
· Built-in boiler pump.
· PVC/CPVC/PPs approved.
· Low lead certified.
· Self-cleaning, self-draining vertical fin heat exchanger.
· Built-in supply and return sensors control the heat exchanger temperature (versus water temperature), thus eliminating failures.
· Contractor friendly, fewer internal parts, easy to install, maintain and service.
· Outdoor reset technology increases efficiency by lowering the water temp automatically.
· Exceptional value and longevity. Over 2 million installed.
· Includes Air Vent, Outdoor Sensor & Relief Valve.
· 5 Year manufacturer’s parts warranty.
· 10 year limited heat exchanger warranty.

SPECIFICATIONDC 20-125DC 33-160
CSA Input (Natural Gas or Propane) – MBH20 – 12533 – 160
CSA Input (Natural Gas or Propane) – KW5.6 – 36.69.7 – 46.9
CSA Output – MBH18.6 – 110.830.4 – 140.0
CSA Output – KW5.4 – 32.58.9 – 41.0
DHW – CSA Input (Natural Gas or Propane) – MBH20 – 12533 – 124
DHW – CSA Input (Natural Gas or Propane) – KW95.6 – 36.39.7 – 36.3
A.F.U.E95%94%
Min gas pressure (Nat. Gas or Propane) – inch w.c.55
Max gas pressure (Nat. Gas or Propane) – inch w.c.1414
Power (120Vac/60Hz) – Watts @ full fire with internal pump130164
Weight (empty) – lbs/Kg105 / 48105 / 48
Pressure vessel water content – USG/Liters0.5/1.90.5/1.9
Max boiler flow rate – USgpm1111
Min boiler flow rate – USgpm33
Max operating pressure – Space Heating Coil – psig43.543.5
Max operating pressure – Domestic Hot Water Coil – psig150150
Approved installation altitude – ASL10,000 ft10,000 ft
Ambient temperature – Low (°F/°C)32/032/0
Ambient temperature – High (°F/°C)122/50122/50
Max relative humidity (non-condensing)90%90%
Min water temperature – Space Heating (°F/°C)50/1050/10
Max water temperature – Space Heating (°F/°C)194/90194/90
Min water temperature – Domestic Hot Water (°F/°C)104/40104/40
Max water temperature – Domestic Hot Water (°F/°C)149/65149/65
Min flow rate to activate DHW heating – USgpm0.50.5
Max flow rate DHW heating – USgpm44
Max equivalent vent length 2″ (each side)35′35′
Max equivalent vent length 3″ (each side)120′120′
Domestic Hot Water delivery: @70°F/ 39°C temperature rise3.2 GPM

3.2 GPM


EXHAUST PIPE SIZEMAXIMUM EQUIVALENT VENT LENGTH
Schedule 40; CPVC or PPs(each side)
2”35’
3”120’
2” or 3” 90° Long sweep vent elbowAllow 5’ equivalent feet
2” or 3” 90° Short sweep vent elbowAllow 8’ equivalent feet
2” or 3” 45° Vent elbowAllow 3’ equivalent feet
PPs 
PPs 87-90’ElbowAllow 8’ equivalent feet
Flexible PPs 
3” Flexible35 Actual feet


AExhaust Outlet3″ Schedule 40
BCombustion Air3″ Schedule 40
CCold Domestic Water Connection3/4″ Male NPT
DHot Domestic Water Connection3/4″ Male NPT
EHeating Water Inlet (Return)1″ Male NPT
FHeating Water Outlet (Supply)1″ Male NPT
GGas Inlet1/2″ Male NPT
HCondensate Outlet3/4″ Hose
IKnock-out (3)1/2″

HEIGHT
DC 20-125 31.3″ [796]
DC 33-160 31.3″ [796


CONTROLLER AN INDICATOR BUTTONS
1Power IndicatorAPower – ON / OFF
2Space HeatingBSpace Heating / DHW Toggle
3Domestic Hot WaterCMinus
4Main DisplayDPlus
5Fahrenheit and PSIEFahrenheit/Celsius
6Celsius and BarFDomestic Hot Water Comfort / Eco
7Comfort / ECO / OFF – IndicatorGService
8Comfort / ECO / OFF – IndicatorHReset Button
9Service Display  
10Flashes to indicate a fault