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By inhibitor fluid I presume you mean coolant ! change it if you think so. The unit is a very good alloy so the anode is optional. Keeping a couple of spare rubber caps is probably a good idea ! O rings are cheap. I find the average life of end caps on NL gensets is about 10 years. Coolant about...

Same as any heat exchanger ! Clean the tubestack every couple of years.

https://www.aliexpress.com/item/4000242318083.html?spm=a2g0o.cart.0.0.29c63c00b9RVfD&mp=1 You can also use the VMC one https://www.lazada.co.th/products/i2561149930-s9114514216.html?urlFlag=true&mp=1

If you have an old Perkins 6354 and can"t get the 160deg F thermostats anymore you can replace the thermostat core with an Ingersol rand thermostat valve core from their screw compressors as they are identical and you have a choice of temperatures !

I did consider the bowman conversion but It would be major surgery for me and would have to relocate 2nd Alt etc etc so as the manicooler cleaned up ok we will stick with the present mod.

The system as designed was the only big mistake Perkins ever did IMHO Seawater sent through a cast iron manifold has a very finite life !

Well yes the Hx has more capacity than it needs . The thermostat has never been fitted in my engine for the last 15 years ! My cruising speed is 1300rpm so what little extra heat is put into the system makes no difference. I also think there is less load on the raw water pump as it doesn't have...

Depending on condition converting the Manicooler to engine coolant is not that hard just a change of plumbing . Just done mine ! Requires reaming out the tap in the water pump and drilling the inspection plate at the rear of the engine...