Hi, Do you or can you make up a kit for me to replace my D4 heater for a D6L My boat has 90mm pipes reduced to D4 installed by boat manufacturer. With 4 vents the D4 cant keep up.

yes, Butler Technik can supply heater and accessory components to allow successful upgrade to D6L. To be very honest there will not be many re-useable components except your ducting system and potentially your exhaust system. If your D4 installation is of some age then we'd likely recommend to renew the exhaust in addition as the flex can become porous over many years and we're about to put a larger heater in situ. Let me know. If you have further detail to provide that will allow us to accurately quote please email  our Sales Technical team - sales@butlertechnik.com

Thank you

David