yes, we do have theS2 D3L heater in stock, it's a very popular heater. We bespoke build kits for marine applications, we often find this solution as most economic for our customers - it allows us to tailor correct lengths of ducting, exhaust etc, for our customer's installation preferences; also correctly specify fixed open or closing air outlets.
May I suggest you forward over your requirements to email sales@butlertechnik.com - or just call our sales Tech Support 44 01522 243310
Thank you
Regards
David