Your question is way too vague ..... What the heck is it that you want ???
Its like you asking for "the cost of a green truck" ????
Some important things to establish:
1) What is the desired massflow rate, operating pressure and temperture ? What is the fuel ?
2) Why must the boiler be watertube ? Firetube boilers are most economical in the smaller sizes
3) What auxiliary equipment is required ? Condensate collection ? feedwater pumps, stack, dampers etc, etc
4) What are the emissions requirements ? What type of monitoring system is required ?
5) Are there space limitations ?
and on and on ....
MJCronin
Sr. Process Engineer