Best 40 Gallon Oil Fired Water Heaters and Closest Alternatives
If you’re seeking a 40 gallon oil fired water heater, you’re looking for durable hot water with steady recovery for households that rely on oil-fired heating. This guide highlights oil-fired options and practical close alternatives in the 40–50 gallon range, focusing on reliability, ease of maintenance, and efficient performance. Each product section explains who it’s best for, plus a clear pro/con note to help you compare. The top picks cover commercial and residential needs, from robust oil-fired tanks to energy-saving electric and hybrid options for mixed-use homes.
Product Spotlight and Quick Comparison
Summary of selected products and their strengths for quick reference:
- AO Smith COF-455A – Best for compact commercial use; oil-fired with handhole cleanout.
- AO Smith COF-700A – Best for larger commercial applications; robust oil-fired tank features.
- MRCOOL 40 Gallon Electric Water Heater – Best for small to mid-size homes seeking electric performance (as a close alternative).
- Rheem 72-40-2 40 Gallon Electric Water Heater – Best for reliable residential electric performance with good insulation.
- Senville 50 Gallon Hybrid – Best for homes aiming to cut electric bills with heat-pump efficiency while maintaining ample hot water.
AO Smith COF-455A Commercial Oil Fired Tank Type Water Heater
Brand: A. O. Smith
Key features: Barometric Draft Regulator, Single Stage Oil Pump, Handhole Cleanout
Best for: Small to medium commercial settings or larger homes serviced by an oil-fired system needing a durable, accessible tank. The handhole cleanout and draft regulation support easier maintenance and reliable operation in oil-fired installations.
Why chosen: It’s designed for steady oil-fired performance with practical maintenance features that help manage routine service tasks. A limitation is that capacity and configuration specifics vary by installation, so verify compatibility with your system.
AO Smith COF-700A Commercial Oil Fired Tank Type Water Heater
Brand: A. O. Smith
Key features: Barometric Draft Regulator, Single Stage Oil Pump, Handhole Cleanout
Best for: Larger commercial installations or busy multi-family settings needing extended hot water supply. The COF-700A typically supports higher demand scenarios due to its design and oil delivery system.
Why chosen: It offers robust construction and essential maintenance access. Caution: installation typically requires professional service and proper venting considerations for oil-fired units.
MRCOOL 40 Gallon Electric Water Heater 4500W Tank
Brand: MRCOOL
Key features: 40-gallon electric water heater, Dual 4500-watt heating elements, Self-cleaning, Rare Earth Anode
Best for: Small to mid-size homes seeking quick hot water recovery with electric heating. This is a solid substitute when a direct oil-fired option isn’t necessary or when electric installation is preferred.
Why chosen: Fast recovery with dual elements helps maintain steady hot water. Caution: Electric units rely on electricity more than oil-based systems; consider utility rates and wiring needs for your home.
Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater
Brand: Rheem
Key features: Rheemglas lined tank, R-Foam insulation, Anode Rod protects against corrosion
Best for: Homes that want consistent electric hot water with reliable insulation and tank protection. Good fit for replacement in tighter spaces due to standard 40-gallon size.
Why chosen: Known reliability and solid insulation reduce standby losses. Caution: Electric operation will depend on household electricity supply and may not suit oil-fired usage scenarios.
Rinnai REHP50 Electric Heat Pump Water Heater – 50 Gallon
Brand: Rinnai
Key features: Energy Star Certified, 3.75 UEF, up to 73 gallons first-hour performance
Best for: Homes aiming to maximize energy savings while maintaining ample hot water supply, especially in milder climates where heat pump efficiency shines.
Why chosen: High efficiency and demand-response features can cut electricity use. Caution: Temperature setpoints and climate can affect performance and savings.
Rheem PROE50 M2 RH95 50-Gallon Electric Water Heater
Brand: Rheem
Key features: 50-gallon capacity, Enhanced-flow Brass Drain Valve, Automatic Thermostat, Anode Rod
Best for: Households with 3–5 people needing a reliable electric water heater with durable components and efficient control. Ideal for replacing compact existing tanks in homes with limited space.
Why chosen: Combines capacity with practical maintenance features. Caution: As an electric unit, it requires appropriate wiring and dedicated circuit capacity.
Buying Guide: What to Look For in a 40–50 Gallon Water Heater
Tank material and lining influence longevity. Oil-fired tanks often feature robust steel shells and corrosion protection. Look for an anode rod type and an accessible cleanout for maintenance.
Heating method affects energy use. Oil-fired models deliver reliable heat in variable climates, while electric and hybrid units offer energy savings, especially in mild weather with heat pump operation.
Recovery rate matters. A higher wattage or BTU rating means faster hot water recovery after use in households with higher demand.
Ventilation and installation. Oil-fired units require proper venting, clearances, and professional installation. Electric and hybrid models may simplify installation, but electrical capacity matters.
Efficiency ratings. For electric and hybrid units, look at Uniform Energy Factor (UEF) and first-hour rating (FHR). For oil-fired models, evaluate standby losses and venting efficiency.
Frequently Asked Questions
- What is the difference between oil-fired and electric water heaters? Oil-fired models heat water using oil as the fuel source, often with vented chimney systems, whereas electric models use electricity and are typically ventless.
- Is a 40-gallon tank enough for a family of four? A 40-gallon tank typically supports 3–4 people with daily use; higher demand may require a 50-gallon unit or multi-tank configuration.
- Do oil-fired tanks require more maintenance? Oil-fired tanks need venting checks, routine cleaning, and inspection of the burner and draft regulator to maintain efficiency and safety.
- Can electric heat pumps replace a conventional water heater? Yes, but performance depends on climate, home insulation, and hot water demand; heat pumps work best where ambient temperatures are moderate.
- What should I check before buying a replacement water heater? Check capacity, mounting space, venting or electrical requirements, energy efficiency, and ease of maintenance features like anode rods and cleanouts.
- Are there safety considerations for oil-fired water heaters? Ensure proper installation, venting, and professional servicing to prevent gas or carbon monoxide risks and to comply with local codes.