yes that is the one,i have the cylindrical flue termination which seems to work
well and less bulky than the T type.
another thing that you might want to consider is the morco d61b boiler itself,which although is a good quality boiler,and works well at low water flow and low pressure ,it does require the pilot light to be lit all the time whilst in standby mode,ie normal use,this uses a fair amount of gas over a 24hr period,and a bit of a hassel if you have to relight it every time you want hot water because you have turned off the gas for safety
we also looked at a bosch unit that was about £189 that also worked with low water pressure and low flow,the only difference was it had a battery
operated "on demand" pilot light igniter, so avoids having the pilot light running continuiously,making it more economical,and avoids having a lit flame all the time.
the thing that swayed us in favor of the morco was it came with the "marine flue"assembly,which proved to be useless on a boat
due to its flimsy construction in aluminium and no real baffle protection from rain entering the flue in windy conditions.
on hind sight i would have bought the more expensive bosch unit,had i know that i was going to have to fit the kabola/gleamering flue assembly .
sorry i have lost
the link to the bosch unit but if you google
camping /marine instant water heaters you should be able to find the unit~11KW, low flow/low water pressure