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Pump and Return hoses - Bilge pump transfers water in the tub to the heat exchanger on the Wallas.
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Hot Water Test Data (Prelim.) was taken to test the heating effectiveness of the exchanger and recirculation pump. The graph plots the approximate temperature of the water in the tub over time in minutes. The water in the tub and in the boiler was initially 56 degrees F. At 25 minutes, 1 gallon of water was added to the 1 gallon in the tub to determine the recovery time after water is added.
The 36 in. collapsible tub is stowed either against the starboard cockpit gunnel behind a chair or stood up in the motor well. The spring frame tub collapses to a thickness of only 2 inches and sets up quickly using the 4 fiberglass side support rods stowed on the bottom as shown.
An ordinary garden hose coupling and cutoff valve is plumbed into the collapsible tub drain. The hose empties into the mid ships bilge and 1100 gph bilge pump empties the water overboard.
Pump and Return hoses - Bilge pump transfers water in the tub to the heat exchanger on the Wallas.
Hot Tub before filling - Return hose from the heat exchanger is terminated by a hose nozzle or a shower head. The hose nozzle is left open while water is recirculating.
Heat Exchanger is constructed using 25 ft of 3/8 copper tubing coils. The coils are submerged in a pot of water which is heated on the Wallas. THe water hoses are attached to the coil using quick connect fittings. Hoses are stowed out of sight behind the starboard seat cushion for quick deployment.
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Pump and Return hoses - Bilge pump transfers water in the tub to the heat exchanger on the Wallas.

  • Media owner RichardW
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Pump and Return hoses - Bilge pump transfers water in the tub to the heat exchanger on the Wallas.
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"Hot Tub" Project
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Heat Exchanger is constructed using 25 ft of 3/8 copper tubing coils. The coils are submerged in a pot of water which is heated on the Wallas. THe water hoses are attached to the coil using quick connect fittings. Hoses are stowed out of sight behind the starboard seat cushion for quick deployment.
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