I'm in the process of building a shower & toilet facility on my small campsite. The shower block will only be used over the summer season so there's no need for heating. The only requirement i need is hot water for the showers and basins. There's going to be 6 showers for 30 pitches (60 people) at the very peak of the season.

The location of the building will not be near a gas supply. Would a ground source heat pump be suitable? Or, is there a better method available?

Thanks in advance

Dunny

Thanks Tony. Would solar be able to handle the quantity of hot water needed? Looks like i'm going to need a bulk gas tank?

If no gas then solar and instantaneous electric heating. Though may be cheaper to have a very large thermal store and heat on the cheaper night rate.
Can you accurately predict your water usage needs (maybe comparing bills), this will help in sizing a system. Other things to bear in mind are what happens if someone leaves a shower running and solar will not heat up during the night so there will only be 'free' heating at the end of the day.
Really depends what you are trying to achieve, cost reduction, CO2 reduction or green bling.

Solar thermal showers (housed in a truck) have been used at festivals: http://www.big-green-gathering.com/index.php?pageid=221

I'd definitely recommend putting those "push for 20 seconds of water" push-taps on the showers so people can't accidentally leave the water running constantly.