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Campsite Showers Water Heating. For Chris P.

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50kVA diesel three phase generator supply.

Assume two male and two female showers, or are they all uni-sex these days?

I propose to suggest a large hot water tank for hot water storage, (thanks Simon Barker & Broadgage) then have three (say 1kW or 1.5kW or 2kW} immersion heaters if available, to heat the water. This will provide a balanced limited load to assist the generator in starting willingly. A single water thermostat controlling a three phase contactor to control the immersion heaters, to switch them all on or off at the same time. Perhaps a second maually re-settable  "safety" hot water thermostat to cut off it the water becomes too hot.

The hot water storage tank can have a coil for thermal solar panel water heating.

So, what capacity of tank will I need?

What will the heat recovery time be?

What types of showers and shower pump(s)?

If available where can such an insulated  tank be obtained?

What about hot water temperature safety at the shower heads?

Other?

Z.

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    At current prices electric water heating, whether by grid electricity or from local generation might not be the best option.

    Grid electricity is at least 60 pence a unit. Local diesel generation from white diesel will be about 50 pence a unit under favourable conditions.

    Propane is about 20 pence a unit from the larger cylinders, or say about 25 pence per unit of delivered hot water, to allow for the heaters not being 100% efficient.

    Either use a hot water heater that heats a tank, or an instantaneous water heater for each shower. The very substantial peak loading of several showers is easily met with propane. 30 kilowatts is achievable for continuous use, and at least 100 kw for intermittent use. 6 showers each with a 14 kw heater will be fine on a single 47 kilo propane bottle. Automatic changeover valves are usual to prevent interruptions when the first cylinder is empty. A 14 kw gas water gives a far better shower than any common size of electric shower.

    If a hot water tank is used, heat the bottom half from solar thermal sources and the top half from a propane boiler. This will save gas. 

    Do not forget frost protection for plumbing.

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  • 0

    At current prices electric water heating, whether by grid electricity or from local generation might not be the best option.

    Grid electricity is at least 60 pence a unit. Local diesel generation from white diesel will be about 50 pence a unit under favourable conditions.

    Propane is about 20 pence a unit from the larger cylinders, or say about 25 pence per unit of delivered hot water, to allow for the heaters not being 100% efficient.

    Either use a hot water heater that heats a tank, or an instantaneous water heater for each shower. The very substantial peak loading of several showers is easily met with propane. 30 kilowatts is achievable for continuous use, and at least 100 kw for intermittent use. 6 showers each with a 14 kw heater will be fine on a single 47 kilo propane bottle. Automatic changeover valves are usual to prevent interruptions when the first cylinder is empty. A 14 kw gas water gives a far better shower than any common size of electric shower.

    If a hot water tank is used, heat the bottom half from solar thermal sources and the top half from a propane boiler. This will save gas. 

    Do not forget frost protection for plumbing.

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