I am rebuilding my Cabrio and considering ditching the Sierra heater which is the size of a small house in comparrison to the internal size of a Cabrio.
Plus I discovered you have to dismantle half the car to get the Sierra heater in and out if anthing goes wrong with it, which is far from ideal.
Has anyone used a heater from this mob
I was thinking of the modular 3.5Kw heater.
They also do some nice Billet bulkhead heater pipe connections rather than the Marlin stick a rubber hose through a hole approach
Its going to be used in conjunction with an M20 but I don't think the size/volume of the heater matrix is a factor in how well the engine cools.