If you own an RV or plan to buy one, you know how important hot water is for comfort. The Apus RV Tankless Water Heater promises unlimited hot water, energy efficiency, and a compact design. But is it compatible with all RVs? Many RV owners want to upgrade, but worry about installation, power needs, and whether this water heater will work in their specific vehicle. This article explores compatibility, installation, and the details you need to make an informed decision. You’ll learn about technical specs, real-world examples, and common mistakes people make when choosing a tankless water heater for their RV.
What Is The Apus Rv Tankless Water Heater?
The Apus RV Tankless Water Heater is a modern unit designed to deliver endless hot water on demand. Unlike traditional tank water heaters, it does not store water. Instead, it heats water as you need it, which means you never run out of hot water during a shower or when washing dishes. Its compact size makes it popular for RVs, where space is limited.
Key Features
- Instant hot water: No waiting for a tank to heat up.
- Energy efficient: Only heats water when needed, saving gas or electricity.
- Compact size: Fits into small spaces, ideal for RVs.
- Electronic controls: Allows precise temperature adjustments.
- Safety shutoff: Protects against overheating and low water flow.
The Apus is designed specifically for mobile living, but that doesn’t mean it’s universally compatible. Understanding how it works helps you see if it’s the right fit for your RV.
Compatibility: What Does It Mean For Rvs?
Before looking at the details, let’s clarify what compatibility means. For an RV water heater, compatibility covers several areas:
- Physical fit: Will the water heater fit in your RV’s allotted space?
- Power source: Does your RV provide the right gas, electric, or dual-fuel input?
- Water pressure: Is your RV’s pump strong enough for the heater?
- Plumbing connections: Do the pipes and fittings match?
- Ventilation: Is there a safe way to vent exhaust gases outside?
Many RVs are different in size, layout, and utility systems. Some are simple camper vans, others are large fifth wheels or Class A motorhomes. Compatibility depends on these factors.
Physical Size And Installation
The size of the Apus RV Tankless Water Heater is one of its selling points. It’s smaller than most tank models, but not all RVs have the same available space. Let’s look at its dimensions and compare them to common RV water heater spaces.
| Water Heater Model | Height (inches) | Width (inches) | Depth (inches) |
|---|---|---|---|
| Apus RV Tankless | 15 | 12 | 5 |
| Standard RV Tank (6 gal) | 16 | 16 | 17 |
| Suburban Tankless | 14 | 12 | 6 |
Most newer RVs have space for tankless models. But older RVs or very small campers may have tight compartments. Measure your available space before buying. If your RV has a tank water heater, removing it may leave extra room, but you must check for mounting brackets and door sizes.
Installation Challenges
- Some RVs require custom brackets for mounting.
- Access for plumbing and electrical work may be limited.
- The Apus needs a vent to the outside, which may require cutting a hole.
Non-obvious insight: Many RV owners forget to check door size. The heater must fit not only inside, but also through the access door.
Power Requirements: Gas, Electric, Or Both?
The Apus RV Tankless Water Heater comes in several versions: propane gas, electric, and dual-fuel. Your RV must match the heater’s power source.
Gas-powered Models
Most RVs use propane for water heating. The Apus gas model requires a standard propane hookup. If your RV uses a smaller propane tank, you may need to upgrade or refill more often.
- Typical input: 12,000–36,000 BTU/hr
- Needs a safe vent for exhaust
Electric Models
Some RVs are fully electric, especially newer models and conversion vans. The Apus electric model needs:
- 120V AC power
- 12–15 amps dedicated circuit
If your RV only has 12V DC power, you must install an inverter. Be careful, as tankless heaters draw significant power, especially for longer showers.
Dual-fuel Models
A dual-fuel model can use propane or electric. This is useful for RVs with both hookups, or for owners who camp in places with shore power. You can switch modes based on what’s available.
| Apus Model | Fuel Type | RV Power Needed |
|---|---|---|
| Gas Only | Propane | Propane tank, 12V control circuit |
| Electric Only | 120V AC | Dedicated circuit, shore power/inverter |
| Dual-Fuel | Propane & 120V AC | Both hookups, switchable |
Common mistake: Some buyers don’t check their circuit breaker panel. If your RV’s panel cannot supply enough amps, the heater will trip the breaker.
Water Pressure And Flow Rate
Tankless water heaters need minimum water flow to activate. The Apus requires at least 0.4–0.5 gallons per minute (GPM) to turn on. If your RV’s water pump is weak, the heater won’t work properly.
- Average RV water pump: 2.5–3.5 GPM
- Apus minimum flow: 0.4 GPM
- Apus maximum flow: 2.0–2.5 GPM
If you have a small camper with a low-pressure pump, you may need to upgrade. Most mid-size and large RVs are fine, but always check your pump specs.
Non-obvious insight: Many RVs have pressure regulators at the inlet. If the regulator is set too low, the heater may not activate, especially when using city water.
Plumbing Connections And Fittings
The Apus uses standard ½-inch NPT fittings. Most RVs use this size for water lines, but some older models have ⅜-inch lines. Adapters are available, but installation may be trickier.
Plumbing Checklist
- Hot and cold water lines must reach the heater location
- Bypass valves are recommended for winterizing
- Use quality PEX or copper lines for durability
If you upgrade from a tank heater, you may need to reroute pipes. Always check for leaks after installation.
Example: A 2010 Class C RV with a 6-gallon tank heater uses ½-inch PEX lines. Swapping for an Apus takes about 2 hours if you have the right tools and adapters.
Ventilation And Exhaust Safety
Gas models need proper ventilation. The Apus comes with a direct vent kit, but your RV must have a wall or roof opening.
- Exhaust pipe must be installed outside
- No ventless models are available (for safety)
- Electric models don’t need venting
Some RVs have a water heater compartment with a vent door. Check if it matches the Apus vent diameter. Cutting a new hole is possible but requires careful sealing to prevent leaks.
Common mistake: Not sealing the vent correctly. Water can leak into the RV during rain, causing damage.
Is The Apus Compatible With All Rvs?
Now, let’s answer the main question: Is the Apus RV Tankless Water Heater compatible with all RVs?
The short answer is no, but it is compatible with most RVs that meet certain requirements. Here’s a summary:
| RV Type | Compatibility | Notes |
|---|---|---|
| Class A Motorhome | High | Usually fits, enough power, easy install |
| Class C Motorhome | High | Fits most models, check vent size |
| Travel Trailer | Medium | Space varies, check propane/electric |
| Fifth Wheel | High | Large space, easy install |
| Camper Van | Low-Medium | Space limited, power may be low |
| Truck Camper | Low | Very limited space, weak pump |
Most Class A, Class C, and fifth wheels are compatible. Travel trailers and camper vans may need extra work.
Step-by-step Compatibility Check
If you want to install the Apus, follow these steps:
- Measure space: Check the compartment and access door.
- Check power: Confirm propane, electric, or dual-fuel capability.
- Inspect water pump: Make sure flow and pressure meet minimum specs.
- Review plumbing: Find out if your water lines are ½-inch NPT.
- Check venting: Ensure you can install the vent safely.
If you answer yes to all these, your RV is compatible.
Real-world Examples: Success And Failure
Successful Installation
Example 1: A 2022 Class A owner replaced a 10-gallon tank water heater with the Apus dual-fuel model. They had enough space, upgraded the electrical circuit, and installed the vent in a pre-existing door. Now, they enjoy unlimited hot water and lower propane use.
Example 2: A 2015 fifth wheel had a failed tank heater. The owner measured the compartment, installed the gas Apus model, and found plumbing was easy to adapt. The vent matched the old heater’s exhaust.
Problems With Compatibility
Example 3: A 2008 camper van owner bought the Apus electric model. The van only had 12V DC power and limited space. Installation failed because the inverter could not supply enough amps. The heater fit physically, but power was the issue.
Example 4: A small truck camper had a weak water pump and tight compartment. The heater could not fit, and the pump failed to activate the unit.
Non-obvious insight: Always check both power and water specs. Many people focus only on physical size and forget these other factors.
Comparing The Apus With Other Rv Tankless Water Heaters
The Apus is not the only tankless water heater for RVs. Let’s compare it with two popular models: Suburban and Girard.
| Model | Fuel | Min Flow (GPM) | Power Draw | Size (inches) | Price ($) |
|---|---|---|---|---|---|
| Apus | Gas/Electric/Dual | 0.4 | 12V/120V AC, 36,000 BTU | 15x12x5 | 650 |
| Suburban | Gas/Electric | 0.5 | 12V/120V AC, 35,000 BTU | 14x12x6 | 620 |
| Girard | Gas | 0.6 | 12V, 42,000 BTU | 12x12x7 | 600 |
The Apus offers lower minimum flow and dual-fuel options, but is slightly larger than Girard. Price is competitive, but installation cost can vary.
Common Mistakes When Choosing A Tankless Water Heater For Your Rv
- Ignoring power requirements: Not all RVs can supply enough amps for electric models.
- Forgetting about water pressure: Weak pumps won’t activate the heater.
- Not checking venting needs: Gas models require a safe exhaust.
- Assuming all RVs have standard plumbing: Older RVs may need adapters.
- Skipping space measurements: The heater must fit through the door and in the compartment.
Avoid these mistakes by following the compatibility checklist.
Practical Tips For Successful Installation
- Always measure twice before buying.
- Upgrade your water pump if flow is low.
- Use quality sealant around vents to prevent leaks.
- Label water lines during installation to avoid confusion.
- If unsure, hire a professional RV technician.
Non-obvious insight: Some RVs have hidden compartments and wiring. Remove panels to check space and access before starting.
How The Apus Tankless Water Heater Benefits Rv Owners
While compatibility is key, the Apus has clear advantages for those who can install it.
- Endless hot water: Great for families and longer showers.
- Energy savings: No standby heat loss like tank heaters.
- Space saving: Frees up storage in the RV.
- Easy temperature control: Electronic controls are more precise.
- Less maintenance: No tank to flush or replace.
If your RV is compatible, the Apus is a strong upgrade.
When The Apus Is Not A Good Choice
Some RV owners may find the Apus unsuitable:
- Very small campers with limited power and space
- RVs used mostly in extremely cold weather (risk of freezing pipes)
- Owners who dry camp often without shore power or large propane tanks
In these cases, a smaller tank model or portable water heater may be better.
Where To Find More Information
For technical details, installation guides, and compatibility lists, visit the official Apus website or see this RV Water Heater Guide for expert advice.
Frequently Asked Questions
How Do I Know If My Rv Is Compatible With The Apus Tankless Water Heater?
Check your RV’s available space, power source (propane or electric), water pump specs, plumbing size, and venting options. If all meet the Apus requirements, your RV is compatible.
Can I Install The Apus Water Heater Myself, Or Do I Need A Professional?
Many RV owners install it themselves, but if you’re not comfortable with plumbing, electrical, or venting work, hire a professional. Proper installation prevents leaks and electrical hazards.
What Happens If My Water Pump Is Too Weak?
If the pump cannot reach the minimum flow (0. 4 GPM), the heater will not turn on. Upgrade to a stronger pump or adjust pressure regulators to meet the minimum requirement.
Is The Apus Tankless Water Heater Safe For Winter Use?
It is safe, but you must winterize your RV by draining water lines and using bypass valves. Tankless heaters can freeze if water is left inside during cold weather.
Does The Apus Work With Both City Water And Onboard Tanks?
Yes, as long as water pressure meets the minimum requirement. Some city water hookups may have low pressure if a regulator is used, so check settings before using.
Upgrading to a tankless water heater like the Apus can transform your RV experience, but compatibility is not guaranteed for every model. Careful planning, measurement, and understanding your RV’s systems are essential. If your RV meets the requirements, you’ll enjoy the benefits of endless hot water, energy savings, and more comfort on the road.
For more expert advice, visit trusted RV resources or consult a technician before making your final choice.
