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You might know it as a hot tub.


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Had a friend here in SoCal in 1971, built an in-ground "hot tub" for himself out of cinder block. No plumbing. No rebar. Parked an old car nearby on the lawn, used 2" PVC and ferncos to bypass radiator, connected directly to water pump and block. For about $5 in gas, he could heat it up in an hour and keep it hot all night.

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