Thos. Somerville Co.
Skip to main content
Ship
Find a Location
Contact Us
Site Search
submit search
Sign In
Cart (
)
{0} items in cart
menu
Search
Cart
Sign In
Selectors
Copper Selectors
PVC Selectors
Import Black Fitting Selectors
CPVC Selectors
ProPress Selectors
ACR Fittings
HVAC Equipment
Air Handling Units
Commercial Air Handlers
Residential Air Conditioner Air Handlers
Residential Floor Mount Air Handlers
Residential Heat Pump Air Handlers
Residential Wall Mount Air Handlers
Condensers & Air Conditioners
Commercial Air Conditioners Split System
Residential Air Conditioner Split System
Electric Process Heaters
Immersion Wells
Evaporator Coils
Air conditioner Evaporators
Furnaces
Electric Furnaces
Gas Furnaces
Oil Furnaces
Heat Pumps
Commercial Heat Pump Split Systems
Heat Pump Accessories
Heat Pump Electric Heaters
Heat Pump Risers
Residential Heat Pump Split Systems
Heaters
Fan Convectors
Gas Unit Heaters
Patio Heaters
Mini Split Equipment
Mini Split Air Conditioner Indoor Units
Mini Split Air Conditioner Outdoor Units
Mini Split Heat Pump Indoor Units
Mini Split Heat Pump Outdoor Units
Residential Heat Pump Mini Split Systems
Packaged Units
Air Conditioner Packaged Units
Gas Heating/Electric Cooling Pkgd. Units
Heat Pump Packaged Units
Packaged Unit Accessories
Packaged Unit Heaters
Plumbing Hardware
Shower Drains & Accessories
Bathtub Drains
Bathroom Drain Flanges & Accessories
Rough-In Kits
Drain Seals & Covers
Bath Wastes & Overflow
Bathtub Drain Trim Kits
Bathtub Drain Stoppers
Bathtub Drain Parts
Bathtub Drain Face/Overflow Plates
Channel & Tile Drains
Debris Strainers
Shower Drain Accessories
Shower Drain Plates
Shower Drains
Shower Drain Covers
Sink Drains & Fittings
Sink Drain Accessories
Sink Drain Flanges
Bathroom Sink Drains
Sink Drain Rod Assemblies
Sink Drain Traps
Sink Drains
Sink Strainer Baskets
Sink Strainers & Stoppers
Sink Tailpieces & Extension Tubes
Pop-Ups & Accessories
Plumbing Drains & Traps
Bottle Traps
Cleanouts & Cleanout Covers
Drain & Traps Washers
Floor Drain Trap Seals
Floor Drains
Grease Traps
Plumbing Drains & Traps Accessories
Roof Drains
Special Traps
Trap & Supply Covers
Tubular Extensions
Tubular Fittings
Tubular Flush Ells & Slip Ells
Tubular J-Bends
Tubular Offsets
Tubular P-Traps
Tubular S-Traps
Tubular Tailpieces
Waste Bends
Plumbing Specialties
Air Admittance Valves
Closet Bolts
Closet Flanges
Flexible Gas Connectors
Gas Appliance Connectors
Gas Connector Fitting
Plumbing Access Panels
Plumbing Nuts & Washers
Test Caps
Test Plugs and Balls
Trap Primers
Water Connectors
Sewage Tanks & Septic Tanks
Sewage & Septic Tank Accessories
Water Supply Fittings
Ice Maker Fittings
Supply Boxes
Washing Machine Fittings
Water Supply Fitting Accessories
Water Supply Flanges
Water Supply Flexible Hoses
Water Supply Kits
Water Supply Risers
Water Supply Stops
Air Distribution
Dampers
Damper Accessories
Damper Actuators
Duct Dampers
Motorized Dampers
Pressure Relief Dampers
Specialty Dampers
Volume Control Dampers
Ducting
Duct Accessories
Duct Fittings
Duct Plenums
Flexible Ducts
Oval Ducts
Rectangular Ducts
Return Air Products
Round Ducts
Grilles, Registers & Diffusers
Ceiling & Register Boxes & Outlets
Diffusers
Grilles
Registers
More
Home
/
Brands
/
AO Smith®
/
Water Heaters
/
Tankless Water Heaters
/
Gas Tankless Water Heaters
Gas Tankless Water Heaters
27
items
Filter
Skip to Results
Search Within Brand
Stocked Items
Stocked Items Only
Commercial/Residential/Dual
Commercial/Residential (20)
Residential (3)
Commercial (1)
Condensing/Non Condensing
Condensing (16)
Non-Condensing (8)
Dimensions
23-5/8 in H x 17-3/4 in W x 11-1/4 in D (6)
Energy Factor
0.82 (5)
0.95 (6)
0.9 (2)
0.93 (8)
0.81 (3)
Flow Rate
10 gpm (9)
6.6 gpm (8)
8 gpm (7)
Fuel Type
Liquid Propane (8)
Natural Gas (16)
Gas Connection
3/4 in NPT (22)
1/2 in NPT (2)
Heating Capacity
199000 Btu/hr (8)
180000 Btu/hr (4)
160000 Btu/hr (4)
190000 Btu/hr (4)
140000 Btu/hr (2)
120000 Btu/hr (2)
Ignition Type
Electronic (5)
Electronic Spark (19)
Indoor/Outdoor
Outdoor (3)
Indoor (21)
Pressure Rating
15 to 150 psi (24)
Series
ATI-240HX3-N (1)
ATI-240HX3-P (1)
ATI-340HX3-N (1)
ATI-340HX3-P (1)
ATI-540HX3-N (1)
ATI-540HX3-P (1)
Ultra Low NOx
No (6)
Yes (18)
Vent Size
3/4 in (6)
3 in, 4 in (9)
3 in, 5 in (2)
3 or 4 in (4)
Vent Type
Power (6)
Direct/Power (16)
Concentric (2)
Water Connection
3/4 in NPT (18)
Sort by
Best Match
Product: A to Z
Product: Z to A
Product List View
List
Product Grid View
Grid
Product Table View
Table
Results Per Page
10
20
30
40
First page
Previous page
1
2
3
Next page
Last page
content loaded
Compare
AO Smith®
AO Smith® 100123378 ATI-540H Tankless Water Heater, Natural Gas Fuel, 199000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 10 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101933
MFG #
100123378
Add to Cart
Compare
AO Smith®
AO Smith® 100123391 ATI-340H Tankless Water Heater, Natural Gas Fuel, 180000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 8 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101931
MFG #
100123391
Add to Cart
Compare
AO Smith®
AO Smith® 100123440 ATI-540H Tankless Water Heater, Liquid Propane Fuel, 199000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 10 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101934
MFG #
100123440
Add to Cart
Compare
AO Smith®
AO Smith® 100123453 ATI-340H Tankless Water Heater, Liquid Propane Fuel, 180000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 8 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101932
MFG #
100123453
Add to Cart
Compare
AO Smith®
AO Smith® 100123466 ATI-240H Tankless Water Heater, Natural Gas Fuel, 160000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
105935
MFG #
100123466
Add to Cart
Compare
AO Smith®
AO Smith® 100123473 ATI-240H Tankless Water Heater, Liquid Propane Fuel, 160000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
105936
MFG #
100123473
Add to Cart
Compare
AO Smith®
AO Smith® 100123492 ATI-140H Tankless Water Heater, Natural Gas Fuel, 120000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.9, Commercial/Residential
Part #
101935
MFG #
100123492
Add to Cart
Compare
AO Smith®
AO Smith® 100123498 ATI-140H Tankless Water Heater, Liquid Propane Fuel, 120000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.9, Commercial
Part #
101936
MFG #
100123498
Add to Cart
Compare
AO Smith®
AO Smith® 100227678 ATI-310C Tankless Water Heater, Natural Gas Fuel, 190000 Btu/hr Heating, Indoor/Outdoor: Indoor, Non-Condensing, 8 gpm Flow Rate, Concentric Vent, 3 in, 5 in Vent, 0.82, Commercial/Residential
Part #
107307
MFG #
100227678
Add to Cart
Compare
AO Smith®
AO Smith® 100227685 ATI-510C Tankless Water Heater, Natural Gas Fuel, 199000 Btu/hr, Indoor, Non-Condensing, 10 gpm, 3 in, 5 in Concentric Vent, 0.82, Residential
Part #
107308
MFG #
100227685
Add to Cart
Compare
AO Smith®
AO Smith® 100123378 ATI-540H Tankless Water Heater, Natural Gas Fuel, 199000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 10 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101933
MFG #
100123378
Add to Cart
Compare
AO Smith®
AO Smith® 100123391 ATI-340H Tankless Water Heater, Natural Gas Fuel, 180000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 8 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101931
MFG #
100123391
Add to Cart
Compare
AO Smith®
AO Smith® 100123440 ATI-540H Tankless Water Heater, Liquid Propane Fuel, 199000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 10 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101934
MFG #
100123440
Add to Cart
Compare
AO Smith®
AO Smith® 100123453 ATI-340H Tankless Water Heater, Liquid Propane Fuel, 180000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 8 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
101932
MFG #
100123453
Add to Cart
Compare
AO Smith®
AO Smith® 100123466 ATI-240H Tankless Water Heater, Natural Gas Fuel, 160000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
105935
MFG #
100123466
Add to Cart
Compare
AO Smith®
AO Smith® 100123473 ATI-240H Tankless Water Heater, Liquid Propane Fuel, 160000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.95, Commercial/Residential
Part #
105936
MFG #
100123473
Add to Cart
Compare
AO Smith®
AO Smith® 100123492 ATI-140H Tankless Water Heater, Natural Gas Fuel, 120000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.9, Commercial/Residential
Part #
101935
MFG #
100123492
Add to Cart
Compare
AO Smith®
AO Smith® 100123498 ATI-140H Tankless Water Heater, Liquid Propane Fuel, 120000 Btu/hr Heating, Indoor/Outdoor: Indoor, Condensing, 6.6 gpm Flow Rate, Direct/Power Vent, 3 in, 4 in Vent, 0.9, Commercial
Part #
101936
MFG #
100123498
Add to Cart
Compare
AO Smith®
AO Smith® 100227678 ATI-310C Tankless Water Heater, Natural Gas Fuel, 190000 Btu/hr Heating, Indoor/Outdoor: Indoor, Non-Condensing, 8 gpm Flow Rate, Concentric Vent, 3 in, 5 in Vent, 0.82, Commercial/Residential
Part #
107307
MFG #
100227678
Add to Cart
Compare
AO Smith®
AO Smith® 100227685 ATI-510C Tankless Water Heater, Natural Gas Fuel, 199000 Btu/hr, Indoor, Non-Condensing, 10 gpm, 3 in, 5 in Concentric Vent, 0.82, Residential
Part #
107308
MFG #
100227685
Add to Cart
Sort by
Best Match
Product: A to Z
Product: Z to A
Product List View
List
Product Grid View
Grid
Product Table View
Table
Results Per Page
10
20
30
40
First page
Previous page
1
2
3
Next page
Last page
