| 摘要 |
A low-cost warm water heater for use in portable toilets, to provide unblend ed warm water for hand washing provides a small quantity of warm water at a predetermined temperature, the flow being sensibly at ambient pressure. The water system is supplied by hand or foot pump, or gravity feed, using a low power electric immersion heater, within a small, fabricate d plastic casing that is of standard fittings, solvent welded to provide a substantially vandal- proof, child-proof heater. Provision of a cold water feed with vacuum break protects the heater against being siphoned dry. Snap-in hose connections simplify assembly and maintenance. While electrical ly protected by the plastic case construction, electrical ground-fault protection may also be utilized. A stand-alone embodiment incorporates a diaphragm foot pump to provide spurts of warm wate r.
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