Heating Help

cast iron modulating comercial

I am bidding a Federal job. I have a walk through in a two days. The spec. book is asking for design build but specifically asks for cast iron modulating energy star rated. I don't know the exact BTU I will need but they included pics of old boilers that look like they are in the million BTU range. Any Ideas. I know about the Ray but its probably not big enough.

A mod non-con boiler

I'd like to see modulating non condensing boilers developed. Times were when we had step fire or mechanical modulating copper tube boilers. I know Raypak offered two step and mech mod gas valves, probably other manufacturers also.

With todays burner technology maybe it's time to re-examine modulation cast iron also. Not necessarily a cast iron condensor, like the rAY. But a line of residential sized cast iron with modulation for 140F and higher supply temperatures.

There may be some commercial products already available?

hr

Commercial energy star

I have seen Bryan flex tube commercial boilers from the 70s with variable rate gas valves tied to a aqua stat that sends floating point control. And I know parker makes a four stage cast iron. But energy star rated. Do they even rate commercial boilers with energy star?

try the KN boilers

They are the big brothers to the Ray, actually they are the Ray just more sections.

Mod/con cast iron

The KN series are Energy Star rated. They are even more efficient at low fire than high fire. You also don't have to do a pr/sec but you need to use a reverse return on multiple boilers. They use RBI's HeatNet protocol that lets you control 10 boilers.
Check the new line of KN boilers as they will go up to 2 million.
Here is the link:
http://www.hydrothermkn.com/
Regards,
Henry

several good choices for this

dedietrich and viessmann both make a CI boiler with modulating burner, this is off the shelf stuff. and I would bet Buderus has a similar product in the lineup. either of these will make you smile - especially if you couple them to the digital Weishaupt mod burner.

Vitocrossal Baby

Get a Viessman rep in on that job! 98% efficient!