10 Best Indirect Water Heater of December 2025

SunnyHome

• Heavy gauge Steel tank
• Inner Dura glas lined tank fired at 1,600°f for optimum protection from the effects of corrosion
• Factory installed Brass drain valve on all models allows for easy draining of the unit which reduces sediment deposits extending tank life
• Factory installed Brass temperature/pressure relief valve
• American standard point-of-use electric water heaters are all certified at 300 psi test pressure and 150 psi working pressure. All tanks are also 100% hydrostatically tested at the factory

American Standard Water Heaters

• VOLTS:120 / HERTZ:60 / PHASE:1 / TYPE:ELECTRIC / RESIDENTIAL
• MAX WORKING PRESSURE:150 PSI / CONNECTION:1"
• DOMESTIC HOT WATER STORAGE VOLUME:29.6 GALLONS / BOILER HOT WATER VOLUME:1.7 GALLONS
• MAX BOILER WATER TEMP:200F
• DIMS:36 1/4"H X 21 3/4" DIAMETER

AQUA PLUS

• High performance domestic hot water.Durable high grade 316L stainless steel with fail proof, welded stainless steel dip tube
• Full 2" plus of insulation for an extremely low heat loss. Quality brass drain and T+P valves are factory Installed. A Thermoplastic jacket that will not corrode or dent
• 40 Gallons Capacity. Piping Connections: 3/4" Domestic Water In/Out, 1" Boiler water In/Out. 23.5 Boiler Diameter.
• Limited lifetime residential warranty, Details below in description
• PLEASE NOTE: In order to Purchase this product, we would need an assurance this product is being installed by a Licensed Gas technician for safety purposes. Details would be required before shipping to make sure the technician/The Company is registered to install this Product. Thanks for cooperation.

BIC

• Exclusive "Tank-in-Tank" Technology
• Abundant Domestic Hot Water at the Lowest Possible Cost
• 2" of Polyurethane Foam Insulation
• Lowest Pressure Drop in the Industry
• Self Cleaning/Self Descaling Heat Exchanger

Triangle Tube

• Tank cylinder and heat exchanger made of 444 Stainless Steel
• Superior insulation keeps water hot for hours during standby
• Adjustable feet for uneven floors*
• Rugged design with coated steel jacket and heavy-duty polymer top and bottom to resist cracks and abrasions*
• Limited lifetime warranty

Crown Boiler

• At 18,500 Btu/hr, this product will help heat the water in a 40gal. tank.
• 3/4" MPT (Water Heater side) and 1" MPT (System side)
• The fins in this heat exchanger produce turbulence to increase water heating efficiency. The double wall helps prevent water contamination.
• Our product comes with a 1.5-year warranty to cover manufacturer defects.
• These can be used for Domestic Hot Water Heating, Outdoor Wood Furnaces, Solar Hot Water Heating, Residential Plumbing

AB

• Seamless hydrastone-lined tank
• Very low standby heat loss
• Easy indoor installation
• Easy service
• Utilizes a side mounted coil that is supplied separately

Burnham

• VOLTS:24 / HERTZ:60 / PHASE:1 / TYPE:ELECTRIC / APPLICATION:RESIDENTIAL,
• FLOW RATE:8 GPM / DHW STORAGE VOLUME:39.9 GALLONS / BOILER HOT WATER VOLUME:1.9 GALLONS
• DHW IN/OUT CONNECTION:3/4"NPT / BOILER WATER IN/OUT CONNECTION:1"NPT
• MAX DHW/BOILER TEMP:160F/200F, / MAX WORKING BOILER/WATER PRESSURE:150 PSI/145 PSI
• DIMS:46-1/4"H X 21-7/8"DIA

"AQUA PLUS"

• Weil Mclain 633-900-130 Thermostat (Aquastat) Kit For Residential Indirect Water Heaters
• For Use With GOLD / Ultra Plus 30/40/60/80
• Includes Knob And Instructions 90°F-160°F Adjustable Range Does NOT Include Cover Plate
• Sales Reference # 10H001, 633900130

Weil-McLain