Space Heating AND
Water Heating,
Combined

One Efficient Unit,
Two Comfort Solutions

The new Ruud® UltraTM Series High Efficiency Combination Boiler offers both space heating and domestic water heating in one unit. So whether you need the living room to be extra cozy for movie night or you’re ready for a hot, relaxing bath, the Combi Boiler has you covered.

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High Efficiency

A 95% AFUE rating means energy savings and potential rebates

Two In One

Enjoy both space heating and domestic hot water in one durable unit, from a brand you trust

Saves Energy

It only produces domestic hot water when you need it, so you save energy and money

Saves Space

A single combi boiler frees up valuable space by replacing your boiler and tank water heater

How It Works

The Combi Boiler provides space heating and domestic hot water in two separate loops.

Ruud Combi Boiler Features & Benefits

  • 95% AFUE

    Delivers 95 BTUs of heat for every 100 BTUs of gas input, qualifying some customers for local and/or utility rebates

  • Lower Installation Costs

    Installs with 2″ and 3″ Schedule 40 PVC venting, which is easier to work with and lower cost than stainless steel, saving you money and time

  • Plate Heat Exchanger

    Transfers heat generated in the space heating process to the domestic water flow for continuous hot water

  • Separate Loops

    Keep water for space heating and domestic hot water in two separate loops

  • Outdoor Reset Sensor

    Tracks outdoor temperatures and overrides the heating set point as needed to keep the home comfortable when weather changes

  • Built-In Three-Speed Pump

    Offers convenience and performance

  • Auto-Boost

    Kicks in to provide extra heat if the thermostat set point has not been achieved in a reasonable time1

  • Built-in Auto Feeder

    Maintains hydronic loop pressure automatically between 12–30 PSI

  • Max Vent Lengths of 100′ for 3″, 50′ for 2″

    Means more flexible and versatile installation options2

  • Vent With Room Air

    Saves money and time on installation3

More Spec Info

Ruud Model Number RUCBH-199DVLN
RUCBH-199DVLP
RUCBH-180DVLN
RUCBH-180DVLP
Gas Input Rate for
Space Heating4
MAX 120,000 BTU/h 100,000 BTU/h
MIN 18,000 BTU/h 18,000 BTU/h
Gas Input Rate for Domestic
Hot Water (DHW)
MAX 199,000 BTU/h 180,000 BTU/h
MIN 18,000 BTU/h 18,000 BTU/h
AFUE 95% 95%
Turndown Ratio (Space Heating) 6.7:1 5.6:1
Turndown Ratio (DHW) 11:1 10:1
Continuous Flow Rate
(DHW)
MAX 9.9 GPM 9.0 GPM
45°F Rise 7.7 GPM 7.0 GPM
77°F Rise 4.5 GPM 4.1 GPM
Number of Bathrooms5 2–2.5 2
Temp. Range Space Heating 100–180°F
DHW 90–140°F
Type Indoor Direct Vent
Flue System Sealed Combustion Direct Vent or Room Air Intake
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System Premixed Metal Fiber Burner
Gas Valve System Air Ratio Valve
Minimum Activation Flow Rate 0.5 GPM
Minimum Continuous Flow Rate 0.4 GPM
Internal Pipe Material STS 304, Copper Tubing (Primary and Secondary)
Water Holding Capacity Under 2 Gallons
Water Pressure6 MAX DHW 150 PSI / Heating 30 PSI
MIN DHW 15 PSI / Heating 12 PSI
Gas Pressure Nat. Gas 3.5″ WC to 10.5″ WC
LP Gas 8.0″ WC to 14.0″ WC
Materials Casing Cold Rolled Carbon Steel
Heat Exchanger STS 304 Stainless Steel
Safety Devices Flame Sensor, Overheat Cut Off Limit Switch, Gas Leak Detector,
Water Leak Detector, Exhaust Thermistor, Pressure Sensor,
Heating Supply Thermistor
Warranty Residential – 10-Year Heat Exchanger,
5-Year Parts, 1-Year Labor
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Compatible with
Hydronic Air Handlers

The Combi Boiler works with hydronic air handlers, offering the ability to integrate space heating and domestic water heating systems to maximize energy efficiency and minimize energy costs.

Learn More

Enjoy Space Heating and Water Heating in One

Bring home the comfort and savings of the Ruud Combi Boiler.

1Auto Boost Feature requires installation of outdoor reset sensor. 2Up to 50′ @ 2″ and 100′ @ 3″; Maximum equivalent venting lengths: see Installation Instructions for additional details. 3Follow the National Fuel Gas Code (ANSI Z223.1 / NFPA 54). 4Gas input (BTU/h) de-rates at higher than sea level installations. 5Individual results may vary based on temperature rise demands. 6DHW water pressure must be greater than the heating system water pressure.