When I left the car with my mechanic before the weekend we had a quick look, and the heater core hose has an internal diameter of only ~22mm, while the inline coolant heaters I've found are for hoses with 28mm or more
I did find that DEFA makes a heater for the PSA 1.1 engine (part #411766), which looks like this:
but it is 3-4 times more expensive than the heater I found.
Maybe, I'll send an email asking if they could modify the heater casing for my needs. If not, then Theodor won't have get an engine heater
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread