Apply to be a TradeMaster!
Filter menu expanded

Filters

87 items
Reset

SORT

Product Availability

Show In Stock Only (27)

Diameter (Inches)

19-1/4" (1)
20" (4)
20-3/4" (1)
21-3/4" (2)
21-7/8" (3)
22" (16)
22-3/4" (2)
22.75 (1)
23-1/4" (1)
24" (10)

BTU Input

0 - 50,000 (13)
60,000 - 70,000 (4)
80,000 - 90,000 (2)
90,000 - 100,000 (8)
100,000+ (41)

Capacity (Gallons)

20 - 29 (4)
30 - 39 (11)
40 - 49 (15)
50 - 59 (10)
60 - 69 (10)
70 - 79 (5)
80 - 89 (14)
100 - 199 (11)

Review Score

(15)
(11)
(3)
(1)
(1)

Price Range

$50 to $60 (1)
$1000 to $1500 (1)
$1500 to $2000 (16)
$2000 to $2500 (17)
$2500 to $3000 (22)
$3000 to $3500 (8)
$3500 to $4000 (10)
$4000 to $4500 (7)
$4500 to $5000 (1)
$5000 to $10000 (4)

Indirect Water Heaters

Help Face
Need a little help?
87 items
Grid
List
Compare
Product Image of 41 Gallon CH-41Z BoilerMate Champion Series Indirect-Fired Water Heater (Blue)
$1,879.99 each
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of Aqua-Plus 45 Pewter Indirect Water Heater
Aqua-Plus 45 Pewter Indirect Water Heater
SKU: 633-600-001
Weil-McLain
SKU: 633-600-001
Brand: Weil-McLain
(29)
$1,991.61 each
In Stock
Get 5 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 5 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of AL35SL Alliance Hydrastone-Lined Indirect Water Heater
$1,742.80 each
In Stock
Get 8 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 8 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of AL50SL Alliance Hydrastone-Lined Indirect Water Heater
$1,886.20 each
In Stock
Get 14 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 14 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of S32, 31.7 Gallon Indirect Water Heater
$1,708.96 each
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 55 Gallon Alliance Light Transport Indirect Water Heater w/ TPI Thermostat
$1,601.66 each
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 80 Gallon, Squire SIT080 Indirect Water Heater
$2,598.28 each
In Stock
Get 14 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 14 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of Aqua-Plus 55 Pewter Indirect Water Heater
Aqua-Plus 55 Pewter Indirect Water Heater
SKU: 633-600-002
Weil-McLain
SKU: 633-600-002
Brand: Weil-McLain
(14)
$2,676.31 each
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 52 Gallon, Squire SIT050 Indirect Water Heater
$2,079.74 each
In Stock
Get 5 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 5 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of Aqua-Plus 85 Pewter Indirect Water Heater
Aqua-Plus 85 Pewter Indirect Water Heater
SKU: 633-600-003
Weil-McLain
SKU: 633-600-003
Brand: Weil-McLain
(1)
$3,213.58 each
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 67 Gallon, Squire SIT065 Indirect Water Heater
$2,391.01 each
In Stock
Get 8 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 8 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of 40 Gallon, Squire SIT040 Indirect Water Heater
$2,286.60 each
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 80 Gallon Alliance Light Transport Indirect Water Heater w/ TPI Thermostat
$2,280.17 each
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 75 Gallon Laars-Stor Single-Wall Indirect Water Heater LS-SW-2-80-L
$2,375.47 each
In Stock
Get 6 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 6 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 50 Gallon Laars-Stor Stainless Steel Single-Wall Indirect Water Heater
$3,152.14 each
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 3 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of AL70SL Alliance Hydrastone-Lined Indirect Water Heater
$2,523.96 each
In Stock
Get 3 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 3 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of 30 Gallon Alliance Light Transport Indirect Water Heater w/ TPI Thermostat
$1,500.42 each
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 113 Gallon, Squire SIT119 Indirect Water Heater
$4,125.64 each
In Stock
Get 5 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 5 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of SB 300 E 79 Gallon Single Coil DHW Indirect Water Heater Tank
$2,580.32 each
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 60 Gallon Laars-Stor Single-Wall Indirect Water Heater LS-SW-2-65-L
$2,300.80 each
In Stock
Get 8 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 8 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 80 Gallon CH-80Z BoilerMate Champion Series Indirect-Fired Water Heater
$2,768.82 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 75 Gallon - Residential PowerStor Series Single Wall Indirect Water Heater
$2,536.35 each
In Stock
Get 3 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 3 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of LT-160, 42 Gallon - 93,000 BTU Indirect Water Heater
$2,441.02 each
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 30 Gallon Laars-Stor Single-Wall Indirect Water Heater LS-SW-2-30-L
$1,794.85 each
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 4 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 40 Gallon Laars-Stor Single-Wall Indirect Water Heater
40 Gallon Laars-Stor Single-Wall Indirect Water Heater
SKU: LS-SW-2-40R-L
Laars
SKU: LS-SW-2-40R-L
Brand: Laars
$2,425.92 each
In Stock
Get 16 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 16 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 48 Gallon Laars-Stor Single-Wall Indirect Water Heater LS-SW-2-50R-L
$1,918.26 each
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
In Stock
Get 1 by Wed, Jun 10 - Fri, Jun 12
Compare
Product Image of 48 Gallon - Residential PowerStor Series Single Wall Indirect Water Heater
$2,500.19 each
In Stock
Get 2 by Thu, Jun 11 - Mon, Jun 15
In Stock
Get 2 by Thu, Jun 11 - Mon, Jun 15
Compare
Product Image of 41 Gallon CH-41ZDW BoilerMate Champion Series Indirect-Fired Water Heater
$2,319.23 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 75 Gallon - Residential PowerStor2 Series Double Wall Energy Saver Indirect Water Heater
$3,082.47 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of Aqua-Pro 55 Indirect Water Heater
Aqua-Pro 55 Indirect Water Heater
SKU: 633-500-201
Weil-McLain
SKU: 633-500-201
Brand: Weil-McLain
$2,507.42 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of SBB 300 Plus 81 Gallon DHW Indirect Water Heater Tank
$2,702.38 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of Aqua-Plus 105 Pewter Indirect Water Heater
$4,271.53 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 27 Gallon, Squire SIT030 Indirect Water Heater
$1,645.30 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 116 Gallon - Residential PowerStor Series Single Wall Indirect Water Heater
$2,582.77 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of SB 400 E 106 Gallon Single Coil DHW Indirect Water Heater Tank
$2,631.35 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of Aqua-Pro 80 Indirect Water Heater
Aqua-Pro 80 Indirect Water Heater
SKU: 633-500-202
Weil-McLain
SKU: 633-500-202
Brand: Weil-McLain
$2,773.00 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of AL119CLT Alliance Thermoplastic-Lined Indirect Water Heater
$3,484.10 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 81 Gallon, Squire SET080 Stainless Steel Solar Electric Water Heater
$3,894.38 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of SBB 600 Plus 163 Gallon DHW Indirect Water Heater Tank
$4,332.84 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of Aqua-Pro 30 Indirect Water Heater
Aqua-Pro 30 Indirect Water Heater
SKU: 633-500-200
Weil-McLain
SKU: 633-500-200
Brand: Weil-McLain
$1,745.00 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 79 Gallon LT-300 Indirect Fired Water Heater
$3,690.60 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 48 Gallon - Residential PowerStor2 Series Double Wall Energy Saver Indirect Water Heater
$2,064.43 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 67 Gallon, Squire SIT065 Indirect Water Heater (Double Wall)
$3,322.61 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 60 Gallon WHS-60LDW BoilerMate Premier Series Indirect-Fired Water Heater w/ electronic control
$3,905.20 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of SBB 400 Plus 109 Gallon DHW Indirect Water Heater Tank
$2,809.88 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 80 Gallon CH-80ZDW-B BoilerMate Champion Series Indirect-Fired Water Heater
$3,299.67 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of Heat Exchanger Replacement for CH-80 DW Champion Double-Wall Models
$2,130.38 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Compare
Product Image of 41 Gallon CH-41ZCT BoilerMate Champion Series Constant Temperature Water Heater
41 Gallon CH-41ZCT BoilerMate Champion Series Constant Temperature Water Heater
SKU: 2703Z02-6
Amtrol
SKU: 2703Z02-6
Brand: Amtrol
$2,792.82 each
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Backorder
Get it by Thu, Jul 9 - Mon, Aug 10
Resources
FAQs, Manuals & Videos
Videos
Articles
More About Indirect Water Heaters

Indirect Water Heaters use a boiler to heat domestic hot water. Instead of relying on their own burner, they pull heat from your existing system. That means fewer moving parts, lower energy bills, and plenty of hot water when you need it. 

Key Features
  • Boiler-Powered Performance - Taps into your boiler for reliable water heating 
  • Fast Recovery - Internal coil design reheats water quickly between uses 
  • Insulated Tank - Keeps heat in, cuts standby loss 
  • Corrosion Resistance - Stainless or glass-lined tanks stand up to wear 
  • No Open Flame - Quieter and safer than traditional tank heaters
Real-World Benefits
  • Pairs easily with existing hydronic systems 
  • Handles multiple bathrooms and appliances at once 
  • Lowers fuel usage by eliminating a second burner 
  • Operates quietly with fewer mechanical parts 
  • Install & Maintenance Tips 
  • Place near boiler to minimize pipe runs and heat loss 
  • Flush coil once a year to remove buildup 
  • Add a mixing valve to regulate output temps safely
FAQs

Q: Can this replace my current gas water heater? 

 A: Yes, if you already have a boiler system, an indirect heater is a great upgrade.. 

Q: Does it need electricity?  

 A: Just for the circulator pump, no heating element inside. 

Q: How long do indirect heaters last? 

 A: With routine flushing and maintenance, 15 to 20 years is common. 

Q: Do I need a separate pump? 

 A: Yes, to circulate boiler water through the tank coil. 

Q: Is it good for radiant heat systems? 

 A: Absolutely, it integrates well with radiant and baseboard setups.