TR2/3/3A Heater ID

I have the remnants of three heaters as shown in the attached photo. The two on the left are Smith R250 models. The square one on the right has no Id but was in my car. Can anyone ID it for me please?

The one in the middle is correct for the TR3, or should I say its just like the ones me and dad have. The one on the left looks like remnants of another TR heater.

Can't help you with the one on the right.

The one on the left looks like it might be slightly larger than the one in the middle. If so, it may be from an older Land Rover. On the right looks like an aftermarket unit to me, like the ones JC Whitney used to sell. Might even be a Maradyne.

This is an illustration from an article written by a local club member, around 1990, showing how to mount a similar unit in a TR3.

Thanks guys. Both on the left are Smith R250 models. They each have their production tags on them. Thanks for the info re the third.

Lionel the one in the middle still might be good if it holds water just sitting there. Many of the heaters get ruined by people pressure testing them with no clamps. The heater opens up like an accordion and gets about an inch bigger plus I avoid pressure testing, no reason. Moreover, the pressure for those systems is only 4psi. What I am saying is if the heater hold water statically, clean it with hot to warm soapy water over the sink and shake it and dump it over by hand until all the scrap comes out. They are actually kinda rugged if no one poured chemicals in there and or the battery acid did not get on them.

If the middle one does not hold water you can buy a modern core to replace the core.

David