Compact, Hygienic Hot Water with the Viessmann Vitocell 300‑V 42‑Gallon Indirect Water Heater

Need reliable hot water for a smaller home, condo, or tight mechanical closet, without the upkeep of a traditional glass‑lined tank? The Viessmann Vitocell 300‑V (7720348) is a 42‑gallon, single‑coil indirect water heater built from high‑grade stainless steel for long service life and clean, hygienic hot water. Its compact footprint and single internal coil deliver steady recovery from your boiler while taking up a fraction of the space of a larger tank.

Key Features

Single‑Coil, Space‑Saving Design

An 11 sq. ft. stainless steel coil runs through a compact 25″‑diameter tank, making it easy to fit into smaller mechanical rooms, closets, or utility spaces where a larger tank won't work.

Reliable Recovery for Smaller Households

With an AHRI‑certified first hour rating of 223 GPH and 189 GPH continuous draw, this 42‑gallon indirect tank comfortably covers one‑ to two‑bathroom homes and condos without oversizing for the space.

Comfortable, Efficient, and Quiet

Foamed‑in‑place PUR insulation keeps standby losses low, helping the system use less energy to maintain temperature. With no burner or fan in the tank itself, operation is whisper‑quiet.

Installer‑Friendly Layout

Standard NPT connections for DHW, recirculation, and the heating coil streamline piping, while the tank's compact 25″ diameter and 47″ height simplify placement in tight spaces. Integrated sensor wells speed up commissioning.

Product Details

• Compact single-coil design fits easily into tight mechanical rooms and closets
• Stainless-steel tank and coil mean no sacrificial anode to ever replace
• AHRI-rated for 223 GPH first hour recovery — reliable hot water for smaller households
• PUR foam insulation keeps standby losses low for efficient, quiet operation
• Backed by a limited lifetime warranty in residential applications
• German-engineered by Viessmann, a trusted name in heating and hot water technology
• Limited Lifetime Warranty

Viessmann is a global leader in high-efficiency heating systems, known for durable engineering, advanced condensing technology, and long-lasting hydronic boiler solutions.

Additional Information

• Brand: Viessmann
• MPN: 7720348
• Material: Stainless Steel
• Type: Single‑Coil Indirect‑Fired DHW Storage Tank
• Storage Capacity: 42 Gallons (160 L)
• Insulation: Foamed‑in‑place PUR with Vitopearlwhite steel jacket
• Heat Exchanger Coil: 11 ft² (1.0 m²) surface area; 1.95 gal (7.4 L) coil water content
• AHRI Ratings (180°F Boiler Supply): First Hour 223 GPH; Continuous 189 GPH; First Draw 34 Gal
• Standby Heat Loss: ~0.8°F/hr
• Max Working Pressure (DHW): 150 psig (210°F)
• Max Working Pressure (Coil): 220 psig (392°F)
• Connections: 1″ male NPT heating supply/return; ¾″ male NPT domestic hot/cold, recirculation, and T&P
• Dimensions (Diameter × Height, Tilt): 25″ diameter × 47″ height; 50″ tilt height
• Weight (Dry, With Insulation): 126 lb

Viessmann Vitocell 300‑V FAQ

Do I need a boiler to run this water heater?

Yes. The Vitocell 300-V is indirect-fired, meaning it has no burner or electric heating element of its own. It relies entirely on hot water circulated from a boiler or other external heat source through its internal coil. If you don't already have a boiler or heat source with capacity to spare, this tank isn't a standalone solution. 

If you have questions or need assistance picking a boiler, then the Plumbing Deals team can help when you use the live chat feature, email at contact@plumbingdeals.com, or give us a call at 888-682-5956!

How is an indirect-fired water heater different from a standard tank water heater?

A standard gas or electric water heater generates its own heat inside the tank, while an indirect-fired tank like the Vitocell 300-V has no heat source of its own — it acts as an insulated storage vessel with a heat-exchange coil, letting an existing boiler produce both space heating and domestic hot water without installing a second combustion appliance.

Is the 42-gallon Vitocell 300-V big enough for my household?

It's rated for a 223 GPH first hour rating and 189 GPH continuous draw, which comfortably covers a smaller household or a home with one to two bathrooms. For larger households or heavier simultaneous hot water demand, Viessmann offers the same 300-V tank in larger sizes with higher recovery ratings.

Does this tank need a sacrificial anode rod replaced over time?

No. Because the tank and coil are both built from stainless steel rather than glass-lined steel, there's no anode rod to inspect or replace — a maintenance step that most conventional tank water heaters require every few years.

How much heat does the tank lose while sitting idle?

Standby heat loss is about 0.8°F per hour, slightly higher than the larger Vitocell 300-V tanks since a smaller tank has proportionally more surface area relative to its stored volume, but the foamed-in-place PUR insulation still keeps that loss low for a tank this size.

Weight	126.0 lb
Collection	Vitocell 300-V
Height	47.00 in.
Horse Power	1/3
Length	25.00 in.
Room	Utility
Width	26.00 in.
Inventory Number	VIESEVIB42
MPN	7720348

• Spec Sheet
• Owner's Manual
• Warranty