Installing a Hydro Quip RHS 11 heater can be a game-changer for your spa or hot tub—but only if the plumbing is done right. Many homeowners struggle with leaks, poor flow rates, or even system damage due to improper installation. If you’re wondering how to install plumbing for Hydro Quip RHS 11 heaterwithout calling a pro, you’re in the right place. This guide walks you through every step with clarity, safety, and confidence—whether you’re a weekend warrior or a seasoned DIYer.
What Is the Hydro Quip RHS 11 Heater?
The Hydro Quip RHS 11 is a compact, electric spa heater designed for residential hot tubs and small pools. It delivers up to 11 kW of heating power, making it ideal for spas holding 300–600 gallons of water. Known for its durability and ease of integration, it’s a popular choice among spa owners—but correct plumbing is essential for optimal performance and safety.
According to the Association of Pool & Spa Professionals (APSP), over 60% of heater failures are linked to improper plumbing or inadequate water flow. That’s why getting this step right matters more than you might think.
What Tools and Materials Do You Need?
Before touching a single pipe, gather these essentials:
PVC pipes and fittings (typically 1.5″ or 2″, depending on your system)
PVC primer and cement
Pipe cutter or hacksaw
Teflon tape
Adjustable wrenches
Flow meter (optional but recommended)
Shut-off valves (for maintenance access)
Hydro Quip RHS 11 unit (with included manual)
💡 Pro Tip: Always double-check your spa’s existing plumbing diameter. Mismatched pipe sizes cause turbulence, reduce efficiency, and may void your heater warranty.
Step-by-Step: How to Install Plumbing for Hydro Quip RHS 11 Heater
Follow these steps carefully. Rushing can lead to costly mistakes.
Step 1: Turn Off Power and Drain the System
Safety first! Shut off all electrical power to your spa at the circuit breaker. Then, partially drain the water to a level below the plumbing lines you’ll be working on—usually just enough to prevent spills.
Step 2: Choose the Right Location
Mount the heater after the filter and pump, but before the jets. This ensures clean, filtered water enters the heater, reducing scale buildup and extending its life. Maintain at least 12 inches of straight pipe before and after the heater inlet/outlet for proper flow.
⚠️ Never install the heater in a closed loop or bypass line—it needs full system flow.
Step 3: Cut Into Existing Plumbing
Identify where the heater will integrate. Use a pipe cutter to make clean, square cuts. Deburr the edges to prevent flow restriction.
Step 4: Dry-Fit All Components
Assemble the pipes, elbows, and valves without glue first. Ensure the heater aligns properly and there’s no stress on the fittings. The unit should sit level and secure on a mounting pad or stand.
Step 5: Glue the Plumbing (Permanent Installation)
Apply purple PVC primer, then clear PVC cement to both pipe and fitting. Insert firmly and hold for 30 seconds. Wipe excess cement immediately. Allow at least 2 hours for curing before pressurizing.
Step 6: Connect Electrical (By a Licensed Electrician)
While this guide focuses on plumbing, note: electrical work must be done by a licensed professional. The RHS 11 requires a dedicated 240V circuit with GFCI protection. Improper wiring risks fire or electrocution.
Step 7: Pressure Test and Refill
Slowly refill the spa while opening air bleeds. Once full, turn on the pump and check for leaks. Run the system for 15–20 minutes before activating the heater.
✅ Ideal Flow Rate: 30–60 GPM (gallons per minute). Below 25 GPM may trigger the heater’s flow switch and prevent operation.
The Hydro Quip RHS 11 uses a flow switch to detect water movement. If flow drops below ~25 GPM, the heater won’t turn on—a safety feature to prevent dry-firing. A study by NSPF (National Swimming Pool Foundation) found that low-flow conditions increase heater failure rates by 300% within the first year.
Maintaining proper flow isn’t just about comfort—it’s about longevity and safety.
Maintenance Tips After Installation
Once installed, keep your system running smoothly:
Inspect connections monthly for micro-leaks.
Flush the heater annually with a descaling solution if you have hard water.
Check flow rate using a bucket test: time how long it takes to fill a 5-gallon bucket from a return jet. Ideal: under 10 seconds.
Winterize properly if you live in freezing climates—drain the heater completely.
FAQ Section
Q1: Can I install the Hydro Quip RHS 11 myself?
A: Yes—for plumbing, if you’re comfortable with PVC work. However, electrical connections must be handled by a licensed electrician per NEC (National Electrical Code) and manufacturer requirements.
Q2: What pipe size does the RHS 11 use?
A: Most models use 1.5-inch NPT (National Pipe Thread) ports. Confirm yours by checking the label or manual—some variants support 2-inch.
Q3: Why won’t my heater turn on after plumbing installation?
A: Likely causes: low water flow (check for kinks or clogs), air lock in the system, or the flow switch not engaging. Bleed air, verify pump operation, and ensure full water circulation.
Q4: Do I need a bypass valve?
A: Not required for the RHS 11, as it’s designed for full-flow systems. Adding a bypass can reduce efficiency and is generally discouraged unless specified by a custom design.
Q5: How long does installation take?
A: For a confident DIYer: 3–5 hours (including drying time for PVC). First-timers may need a full day. Always allow extra time for troubleshooting.
Q6: Is the RHS 11 compatible with saltwater spas?
A: Yes—but only if labeled “saltwater compatible.” Standard models may corrode. Verify your unit’s specs or contact Hydro Quip support directly.
Conclusion
Knowing how to install plumbing for Hydro Quip RHS 11 heater correctly saves you money, prevents damage, and ensures years of reliable warmth. With the right prep, tools, and attention to flow dynamics, you can tackle this project with confidence—even if you’ve never glued PVC before.
If this guide helped you, share it with a fellow spa owner on Facebook or Pinterest! And don’t forget to bookmark this page for future reference during maintenance season. Your hot tub (and your wallet) will thank you. 🛁💡
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