instantaneous water heater which accepts pre heated water

[Chanireland]

I read about 1 b4 on this forum but cant seem to find again or on the net.
as far as i can remember it
was designed to take preheater water and heat it up to your set temp, it was also used a pulse to regulate the temp and i think was digitally thermostatic i think.
could be used for whole house or single out let including showers can remember if it had a pump...
cant  remember what it  was called any ideas ?

thanks

[dhaslam]

They are referred to as "inline water heaters".   

http://www.navitron.org.uk/forum/index.php/topic,4897.0.html

[Rooster]

Zip water heater ..... http://www.tlc-direct.co.uk/Products/SOILX009.html?source=adwords&kw=ilx009&gclid=CKe1pOaaxZYCFRSO1QodSExeyQ

No pump.

There was talk of a new model, not sure if its out yet.

[Chanireland]

nice 1 thank you