Direct fired water heaters use a gas or electric heating element to heat water on demand, delivering hot water quickly without storing large amounts. This guide highlights five reliable options for RVs, campers, or compact living spaces where instant hot water matters. Each product is evaluated for durability, ease of installation, power options, and suitability for different buyers. For example, frequent travelers may prefer units with easy direct-fit replacements, while tiny-home residents may prioritize compact sizing and flexible power. The quick comparison table below helps you spot the best fit at a glance.
| Product | Best For | Why It Stands Out |
|---|---|---|
| Suburban Advantage 10 Gallon SW10DE | Frequent RV travelers needing reliable on-demand hot water | Porcelain-lined tank; durable; optional electric element for campsite power |
| Suburban SW6DE 6-Gallon | Compact RV setups and small rigs | Durable porcelain tank; replaceable anode; electric option |
| Suburban SAW6D 6-Gallon Direct Fit | Direct replacement in existing RV setups | Direct fit, no modifications; durable porcelain-lined tank |
| APUS 27kW Tankless (Electric) | Whole-home style demand without a storage tank | High flow, self-modulating, digital control |
| 14kW Tankless Electric | Compact electric tankless option | Instant heating with LED temp readouts |
Suburban Advantage RV Tank Water Heater SW10DE — 10 Gallon
The Suburban 10 Gallon SW10DE uses a porcelain-lined steel tank for durability and longevity similar to residential units. It features a replaceable anode rod, which provides corrosion protection and doubles as a drain valve for maintenance tasks. An optional electric element supports heating water when campsite power is available, offering flexible operation for RVers who camp off-grid or with a generator. Best for dedicated RV users who want a larger tank and robust maintenance options.
Who it’s best for: RV owners needing higher hot-water capacity and resilient tank protection. Why selected: the porcelain-lined tank and replaceable anode rod help extend lifespan in rugged travel conditions. Caution: relying on the electric option may require compatible power sources or converters at campsites.
Suburban SW6DE 6-Gallon RV Water Heater
This 6-gallon model emphasizes durability with a porcelain-lined steel tank and a replaceable anode rod that also functions as a drain for maintenance. It offers flexible power options with an optional electric element, letting you heat water using campsite or generator power. Best for smaller RVs or couples who want a balance between compact size and reliable hot water. Why selected: compact capacity with residential-style durability plus power versatility.
Who it’s best for: travelers needing dependable 6-gallon capacity without heavy modifications. Caution: smaller tank means less total hot water during high-demand periods.
Suburban SAW6D Direct Fit 6-Gallon Water Heater
This Direct Fit model is designed for easy RV upgrades. It requires no extensive interior or exterior modifications, offering a straightforward swap for existing 6-gallon units. The tank uses a porcelain-lined steel construction for durability, delivering reliable hot water over years of use. Best for RV owners who want a refresh without complex installation. Why selected: quick upgrade with no depth or plumbing changes. Limitation: installation fit depends on exact RV dimensions and cabinet depth.
APUS 27kW Electric Tankless Water Heater
This high-flow electric tankless option delivers up to 6.5 GPM, suitable for multiple simultaneous uses in homes or larger RV setups. It features a digital display with 1°F adjustment and a memory function for preferred settings. Self-modulating technology helps match power output to demand, reducing energy waste. Best for households requiring continuous hot water without a storage tank. Caution: 27kW service requires appropriate electrical infrastructure and safe installation practices.
Short-Format Tankless Electric (14kW)
Note: This 14kW electric option is a compact tankless setup that shows LED readouts for inlet/outlet temperatures and precise control. It is suitable for small spaces that require instant heating, such as compact apartments or micro-homes with robust electrical capacity. Best for: users who want rapid, on-demand hot water from a compact unit. Caution: heavy electrical draw may require electrical upgrades or dedicated circuits.
Buying Guide: Direct Fired Water Heaters
Key considerations when choosing a direct fired water heater include capacity needs, fuel source, and installation constraints. For RVs and small spaces, weight, size, and mounting options matter. Durability is often tied to tank material and anode protection, especially in rugged travel environments. If you camp off-grid, a model with an electric option can be a valuable backup, but ensure your electrical system can support it. Tankless options offer limitless hot water but require sufficient power and space for installation. When comparing models, consider whether you prioritize ease of replacement, direct-fit compatibility, or a high hot-water flow rate for multi-use scenarios.
Practical questions to guide your decision:
- Do you need a direct-fit replacement or are you open to cabinet modifications?
- Is off-grid heating important, and do you have a reliable generator or campsite power?
- What is your peak daily hot-water demand (showers, dishes, laundry) and tank size needs?
- How much space do you have for installation, and what are access clearance requirements?
- Are you prepared for electrical upgrades if choosing a tankless electric model?
Frequently Asked Questions
- What distinguishes a direct fired water heater from a tankless model?
Answer: A direct-fired heater uses a storage tank and heats water on demand, while a tankless model heats water without storing it, offering unlimited hot water but requiring steady electrical or gas supply. - Can I install a direct-fired heater in an existing RV cabinet without modifications?
Answer: Some models are designed as direct-fit replacements, but others may require cabinet or plumbing adjustments. Check manufacturer specs for fit and clearance. - Is an anode rod necessary for a direct-fired RV water heater?
Answer: Anode rods protect the tank from corrosion and simplify maintenance, extending tank life in many RV installations. - What power sources do these units typically require?
Answer: Most RV heaters can run on propane, with an optional electric element for shore power or generators, while some tankless units are purely electric and require substantial electrical capacity. - How do I determine the right tank size for my RV?
Answer: Consider your simultaneous hot-water needs. A 6- to 10-gallon tank suits most RVs for typical showers and basic tasks, while larger families may benefit from higher capacities or tankless models with high flow.