Which Webasto heater would you recommend for an 11m catamaran

Correct Webasto Diesel water heater sizing for your boat can be influenced by a number of parameters dependent on use. A good starting point may be to refer to our sizing guide at weblink https://www.butlertechnik.com/downloads/cms/7713/webasto-eberspacher-marine-heating-selection-chart.pdf Using this chart it's likely that you'll confirm your Webasto Thermo PRO 90 9kw heater choice, but we always like to learn whether the smaller Thermo Top Evo 5kw heater may be adequate for purpose prior any buying decision is made. Reasons - * Bigger isn't always better with diesel-fired heaters, they actually have greater longevity if they are worked nearer the higher end of their outputs rather than left at low 'idle' output for overlong periods. * The smaller 5kw heater is lower cost to purchase, operate and maintain Please let me know your thoughts