Gas Bains Maries
Four or six gastronorm pot gas bain maries are available from Catering Appliance Superstore, wet heat units manufactured by Parry. The units are intended for mobile catering operations, configured for propane LPG as standard, but they also come with a natural gas conversion kit (no extra cost) so that you can use them in any commercial kitchen.
Obviously plumbing your gas bain marie unit into the natural gas supply to your properly will involve some installation cost, but as gas is generally a cheaper energy supply for heating appliances than electricity, it could be worth the extra outlay if you intend to use the bain maries a lot.
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