We encourage you to call 1-888-878-5512 for complete understanding of Chofu applications before placing an order. We have also put together packages for easier ordering, see Chofu Heater Packages page. For ordering information, please visit our “How to Order” page.

PRODUCT LIST:    
Chofu Wood Fired Water Heater   
Stainless Steel Stove Pipe
Stainless Steel Chimney Cap
Stove Pipe Support Bracket
Brass Thru-Wall Ports (pair)
Thru-Wall Ports with Freeze Plugs   
Thru-Wall Ports (pair)    
Long Shank Thru-Wall Ports (pair)
Drain Assembly for Metal Stock Tanks
Drain Assembly for Plastic Stock Tanks
Digital Metal Stem Thermometer
Metal Stem Thermometer
Replacement Parts:
Stainless Steel Grate    
Chofu Connection Kit
Freeze Protection Port Plug w/O-Ring Seal   
Chofu Drain Plug
Stainless Steel Connecting Tube
Neoprene Connecting Tube
Neoprene Flex Connector
Wire Clamps    
Smoke Outlet Collar
4″ Stove Pipe Adapter
Chofu Replacement Front

Chofu Wood Fired Hot Tub Heater for DIY Hot Tubs

$998.00

The Chofu stove is a precision-built, high-efficiency water heater designed specifically for hot tubs. It circulates water using the principle of “thermosiphon” – the pumping action created by rising hot water, which eliminates the need for a circulating pump or electricity. A double-walled stainless steel water-jacket surrounding the firebox makes the entire firebox a heat-transferring surface. And Chofu’s exclusive high-tech welding process makes it unmatched in durability.

The Chofu wood fired hot tub heater enables you to build your own hot tub using a stock tank, wood tub, bathtub, recycled spa, etc.

It includes: (2) 1¾“Dia. x 10L” stainless circulation pipes, (2) 1¾ Dia. X 9L” neoprene tubes, and (4) clamps for connecting to a tub. Through-wall ports must be selected for the type of tub.

Note – This product is intended for DIYers that plan to get ports, stove pipe, drain assembly, and other parts separately. If you want all of those in one package, check out our Chofu Heater Packages.

SKU: Wood-Fired Heater Category:

Stainless Steel Stove Pipe

$19.50

24-in. long by 4-in. diameter. 8ft required for maximum efficiency of the Chofu wood-fired heater. For the past 18 years this pipe has been made to our specifications by an Amish sheet metal shop using premium grade 304 stainless steel. It’s the highest quality stainless steel stove pipe available and at an affordable price. Read More.

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Stove Pipe Support Bracket

$14.30

For stabilizing stove pipe. Clamps around 4-inch stove pipe with three places for attachment. Necessary for stability when more than 8ft of stove pipe or a chimney cap is used. Wire can be attached from the support bracket to the ground or to a secure structure.

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Brass Thru-Wall Ports (pair)

$62.00

For thin wall tubs with wall thickness of 3/8-inch or less (Stock Tanks, etc). Top port has a deflection plate to diffuse hot water entering tub. Flexible neoprene sleeve bends to accommodate angle of pipe between Chofu heater and tub. Neoprene sleeve accepts either 1-3/4 inch O.D. stainless tubes or 1-1/2 inch PVC pipe. Note: These ports do not receive plugs for Freeze Protection. Two ports require with a Chofu heater.

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Thru-Wall Ports with Freeze Plugs (pair)

$68.00

These ports are required for freeze protection with a tub wall thickness of 3/4 in. thick or less (stock tanks, etc.). Include threaded plugs with O-ring seals.  Require a hole size of 2-3/8 to 2-1/2 in. diameter. Flexible neoprene sleeve bends to accommodate the angle of circulation pipes between heater and tub. Two ports are required with a Chofu Heater.

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Thru-Wall Ports (pair)

$62.00

For thin walled tubs 3/4 in. thick or less (stock tanks, etc). Requires a hole size of 2-3/8 to 2-1/2 in. diameter. Flexible neoprene sleeve bends to accommodate angle of pipe between Chofu heater and tub. Two ports are required with a Chofu heater.

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Long Shank Thru-Wall Ports (pair)

$78.00

These ports are required for a tub wall thickness greater than ¾ in. up to 1-¾ in. thick (wooden tubs). The flexible neoprene sleeve bends to accommodate the angle of the pipe between Chofu heater and tub. These ports also receive optional threaded plugs with O-ring seals for freeze protection. Require a hole size of 2-3/8 to 2-1/2 in. diameter. Two ports are required with a Chofu heater.

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Drain Assembly for Metal Stock Tanks

$78.00

Necessary to completely drain a metal stock tank because the drain provided is located on the side several inches off the bottom. Our stock tank drain assembly is installed on the bottom near the outside edge of the tank (Preferably the same side as the heater). Includes a stainless steel drain fixture, drain pipe, and brass gate valve with a garden hose fitting. Installation requires cutting a hole in the stock tank bottom using a 2-in. metal cutting hole saw mounted on a drill motor. The stock tank must be elevated at least 4-in. off the ground to provide clearance for the drain pipe, but also to achieve the proper height relationship to a Chofu heater for thermosiphon circulation.

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Drain Assembly for Poly Stock Tanks

$81.00

Necessary to completely drain a plastic stock tank because the drain provided is located on the side rather than the bottom. Our drain assembly is installed directly in the bottom near the outside edge of the tank (preferably on the same side as the heater). The plastic stock tank drain assembly includes a longer drain pipe (required when enclosing the tank with vertical side panels). Drain fixture requires a 2-in. hole to be cut in the bottom of the tank using a hole saw with a drill motor. Note: A plastic stock tank must be elevated at least 4-in. off the ground to provide clearance for the drain pipe. Includes a stainless steel drain fixture, drain pipe, and brass gate valve with a garden hose fitting.

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Digital Metal Stem Thermometer

$16.00

Gives a fast reading after stirring water. Responds in 6 seconds compared to a standard mercury bulb thermometer, which take several minutes. The slow circulation of a Chofu heater creates a stratified water temperature, necessitating a quick temperature reading after stirring the tub with a paddle. Non-submersible.

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Metal Stem Thermometer

$9.50

Gives a quick reading after stirring water (non-submersible). Responds in 12 seconds compared to a standard mercury bulb thermometer, which take several minutes. The slow circulation of a Chofu heater creates a stratified water temperature, necessitating a quick temperature reading after stirring the tub with a paddle.

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Replacement Parts:

Stainless Steel Grate

$86.00

Chofu Replacement Grate

This one piece grate replaces the old Chofu two-piece cast iron grates and lasts six times longer.

Chofu Connection Kit

$55.00

Provided with every Chofu heater. Used to connect the Chofu heater to a soaking hot tub. Includes two stainless steel tubes, two neoprene tubes, and four wire clamps. Neoprene tubes come with a 90 degree bend that can be cut (as shown) to make a straight connection. Neoprene tubes have a 1-3/4 inch I.D. and connect to Chofu circulation pipes. Stainless tubes connect to thru-wall ports.

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Chofu Drain Plug

$6.30

Replacement drain plug. This little guy gets easily lost in the grass. Luckily we’ve got replacements. Rubber gasket makes a water tight seal. Finger tightens.

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Stainless Steel Connecting Tube

$12.00

For connecting a Chofu heater to a soaking tub. 10 in. long x 1-3/4 in. outside diameter. Provided with Chofu heater. Can be purchased separately.

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Neoprene Connecting Tube

$12.50

For connecting a Chofu heater to a tub. Connects directly to the Chofu Heater circulation pipes, fastened with wire clamps. Comes with a 90 degree bend but can be cut to form a straight connection between heater and tub, 1-3/4 in. inside diameter. (two tubes provided with Chofu heater)

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Neoprene Flex Connector

$11.20

Used to connect PVC thru-wall ports to stainless steel connecting pipes or 1-1/2 in. ABS pipe. This flexible tube bends to accommodate the angle of the connecting tubes between the Chofu heater and a soaking tub. Can also be used for non-standard hook-ups. 2-3/4 in. long x 1-3/4 in. inside diameter. Secured to pipe with wire clamps.

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Wire Clamps (4)

$6.00

Used to fasten the connections between the Chofu heater and a soaking tub, superior to water hose clamps. Tightened with a screw driver. Package of 4.

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Smoke Outlet Collar

$47.00

This enameled steel collar bolts to the smoke outlet flange of the Chofu heater. Designed with air inducing slits that pull air into the chimney pipe to create secondary combustion for cleaner emissions and reduced sparks. Must be used with a 4-inch stove pipe adapter.

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4″ Stove Pipe Adapter

$46.00

Connects 4-inch stove pipe to the enameled smoke outlet collar on a Chofu Heater. Made of 304 grade stainless steel. Fits snug over the smoke outlet collar of the Chofu heater. Does not need to be permanently fastened to the smoke outlet collar due to a tight fit. Allows entire stove pipe to be lifted off of the heater and stored when not in use.

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Chofu Replacement Front

$186.00

Heavy steel front that fits any Chofu Wood-Fired heater. Includes cast iron door, ash drawer, and baffle clean out plate. Inside of door has a reflective stainless steel plate to deflect heat back into firebox.  Backed with high temperature refractory insulation to keep door from getting hot. Attaches to Chofu stove body with four screws. 

 
Returns
If your order has been damaged in shipment, contact us to get a UPS return label.
Our UPS shipping address:
Island Hot Tub Company
3280 Hilberg Lane
Clinton WA 98236