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Rinnai RUCS75IN 7.5 GPM Residential Indoor Tankless Water Heater

Rinnai RUCS75IN 7.5 GPM Residential Indoor Tankless Water Heater

4.3· 117 ratings

Last price we saw

$899.00at Home Depot, last seen Nov 1

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Our take on the Rinnai RUCS75IN 7.5 GPM Residential Indoor Tankless Water Heater

The Rinnai RUCS75IN is an indoor, natural-gas tankless water heater rated for 7.5 GPM and up to 160,000 BTU. It is ENERGY STAR certified with a 0.9 UEF, so it heats on demand instead of storing a tank of hot water. It has electric ignition, automatic frost protection and a 120–140°F set range. No price was provided for this page, so check the current best price against its recent range before buying.

Best forHouseholds of three to four bathroomsReplacing a tank heater in a utility room or closetBuyers wanting endless hot water on natural gasCold-climate homes needing frost protection
Pros
  • 7.5 GPM handles multiple fixtures at once
  • 0.9 UEF and ENERGY STAR certified
  • 160,000 BTU max output for larger homes
  • Automatic frost protection for cold spaces
  • SCAQMD approved for strict air-quality areas
Cons
  • Natural gas only, no propane version
  • Indoor installation only
  • Needs 120 V power for ignition and controls
  • Caps at 140°F, lower than some competitors
  • Requires gas line and venting work to install

Rinnai RUCS75IN 7.5 GPM Residential Indoor Tankless Water Heater prices at every store

  • Home DepotCheck price at Home Depot

Rinnai RUCS75IN 7.5 GPM Residential Indoor Tankless Water Heater price history

Lowest price we've seen: $899.00 on Nov 1 at Home Depot. Tracked across 1 store since Nov 1.

What reviewers say

Owners rate it 4.3 out of 5 across 117 ratings. Most praise steady hot water and lower gas use; complaints center on installation cost and cold-water flow limits.

Pros
  • Endless hot water for showers and laundry
  • Lower gas bills after replacing a tank
  • Reliable ignition and frost protection
  • Compact wall-mounted footprint
Cons
  • Professional install and venting add cost
  • Output drops in very cold inlet water
  • Some report noisy operation at high demand

Specifications

Energy Efficiency
Uniform Energy Factor (UEF): 0.9, ENERGY STAR® certified (Residential)
Fuel Type
Natural Gas
Product Type
Tankless Water Heater
System Type
Tankless Water Heater
Type Features
Instant heating (Never run out of hot water)
Application
Residential
Heating Method
Tankless
Heating Capacity
160,000 BTU (maximum)
Heating Element
Gas burner
Heating Temperature Range
120 to 140 Deg F
Ignition Type
Electric
Power Source
Gas
Power Voltage
120 V
Power Wattage
89W
Power Amperage
2.3 amp
Max Temperature
140 Deg F
Flow Pressure
20 (low)
Min Temperature
120 Deg F
Safety Features
Automatic frost protection
Safety Certification
SCAQMD Approved
Height
31.1 in
Width
18.5 in
Depth
10.1 in
Weight
57.3 lb

Questions and answers

Is the RUCS75IN worth it over a tank heater?
For a gas-connected home with several bathrooms, yes. It never runs out and its 0.9 UEF cuts standby losses, but the unit plus venting and gas-line work costs more upfront than a tank.
How many bathrooms can 7.5 GPM serve?
About two to three fixtures at once in mild climates. In cold water, output falls, so heavy simultaneous use in winter can outrun it.
Does it work with propane?
No. This model is natural gas only. Rinnai sells separate propane models if you have a tank.
What temperature can it reach?
The set range is 120 to 140°F. That is fine for household use but below models that reach 160°F for commercial or high-demand setups.
Can it be installed outdoors?
No. The RUCS75IN is for indoor installation and needs proper venting to the outside.
When is it cheapest?
Tankless heaters tend to dip during spring and summer promotions and around major sales events. Compare the current price with its recent range before buying.
What do buyers say about the Rinnai RUCS75IN 7.5 GPM Residential Indoor Tankless Water Heater?
Rated 4.3 out of 5 from 117 ratings.

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