Answering the question: which water heater discharge tube best fits your system and needs? This guide highlights five practical discharge and dip tubes from trusted brands. It helps homeowners, technicians, and DIY installers choose reliable options for vented relief valve drainage, condensate drainage for tankless units, and long-bottom delivery of hot water. Each pick suits different setups—from standard 3/4-inch pipes to longer dip tubes for optimal hot water delivery. The summary table below compares core details to aid quick decisions.
| Product | Best For | Diameter / Size | Length / Fit |
|---|---|---|---|
| Reliance 9002273-005 | Relief valve discharge connections | 3/4-Inch | Standard 3/4″ pipe, no size listed |
| AO Smith 100112695 | Dip tube connections and flexible routing | 3/4″ NPT | 4″ length |
| TT FLEX Stainless Steel Connector | Flexible, kink-free run to heater or softener | 3/4″ FIP x 3/4″ FIP | 24″ length |
| Rheem RTG20283 Condensate Kit | Tankless condensate drainage | Not specified (kit) | 6′ silicone tube included |
| Rheem SP11955C | Side-mounted discharge with long run | 3/4-Inch NPT | 42″ total length |
Reliance 9002273-005 3/4-Inch T & P Discharge Pipe
Core use: 3/4-inch discharge pipe attaches to a temperature and pressure relief valve. This simple option is best for standard T&P discharge needs on conventional storage tanks. Best for plumbers or homeowners replacing a worn discharge pipe where the primary requirement is a reliable, rigid connection.
Why chosen: It matches a common 3/4-inch T&P valve outlet and provides a straightforward, durable path for condensate or discharge water. Avoid if you require a flexible line or longer run beyond a standard 3/4-inch pipe.
AO Smith 100112695 DIPTUBE, PEX, 3/4 NPT X 4
Core use: Dip tube extension for PEX connections, helping deliver cold water to the bottom of the tank for consistent hot water. Best for older tanks or setups needing a precise 4-inch dip tube with 3/4″ NPT ends.
Why chosen: The 4-inch length supports more controlled bottom-fill on taller tanks. Choose this if your system requires a PEX-terminated, longer dip tube. Caution: verify compatibility with your tank model before replacing a dip tube.
TT FLEX Stainless Steel Connector 24″
Core use: A flexible, corrugated stainless steel water heater connector with 3/4″ FIP ends. Best for installations needing easier routing around obstacles, with reduced risk of kinking. Ideal for long runs or tight spaces where rigid pipes fail to fit.
Why chosen: It offers high pressure tolerance (up to 250 PSI) and easy installation. Better for routes requiring adaptability. Limitation: flexible hoses may be bulkier and require proper securing to prevent movement over time.
Rheem ProTech Condensate Tubing Kit
Core use: Condensate tubing kit for non-condensing tankless gas water heaters. Best for installers seeking a secure condensate drain path with high-temperature silicone tubing and included clamps and wiring ties for a tidy setup.
Why chosen: The kit provides comprehensive drainage components for condensate management. Choose this if your system is a tankless heater that requires dedicated condensate drainage. Limitation: kit contents may not fit every model without additional adapters.
Rheem SP11955C Side-mounted Run Off Tube
Core use: Side-mounted run off tube with 3/4-inch NPT and a 42-inch total length. Best for Rheem systems or configurations that require a longer, side-mounted discharge path for safe condensate routing away from heat sources or electrical components.
Why chosen: This option aligns with Rheem-specific configurations and provides a longer run for flexible placement. Caution: ensure compatibility with your tank’s inlet fittings and side-mount allowances.
Buying Guide: Key Purchase Considerations
- Discharge purpose: Determine whether you need a T&P discharge pipe, a dip tube, a condensate line, or a flexible connector. Each serves a different drainage or delivery role.
- Connection type and size: Most residential water heaters use 3/4-inch connections. Confirm NPT or FIP ends and verify if adapters are needed for your model.
- Material and durability: Rigid PVC, copper, and stainless steel offer different durability and temperature resiliency. Stainless steel flexes around obstacles but may be bulkier.
- Length and routing: Long discharges require flexible or longer rigid tubes to reach a safe drainage area. Consider side-mounted run-offs for tight installations.
- Compatibility: Some parts are designed for specific brands or tank types (Rheem, Rheem SP-style, AO Smith). Always verify model compatibility before purchasing.
FAQ
- What is a water heater discharge tube?
A discharge tube carries drainage from a temperature and pressure relief valve or other condensate drains to a safe location away from the heater and occupants.
- Do I need a flexible or rigid discharge tube?
Flexibility helps in tight spaces or around obstacles; rigidity provides a durable, straight path in open areas.
- What length should a discharge tube be?
Length should reach a safe drainage area without bending sharply; typical runs range from a few inches to several feet depending on installation.
- Can I mix brands for discharge components?
It’s best to match fittings and thread types. Mixing brands can cause mismatched ends or leaks; verify compatibility before installation.
- Is a condensate kit necessary for tankless heaters?
Tankless condensate drainage often requires a dedicated tube and clamps; a complete kit simplifies installation and ensures secure routing.
- What safety considerations apply?
Ensure the discharge path empties away from electrical outlets, heat sources, and living spaces to prevent damage or scalds.