Security Seal Facebook Twitter GooglePlus Pinterest Newsletter Sign-up
The Wall


Joined on January 19, 2014

Last Post on January 23, 2014

Contact User

Recent Posts

Thanks - Jim Davis disagrees with the underfiring concept:

@ January 23, 2014 9:35 AM in Time Meter for Riello F5 Burner

June 4, 2013: "Underfiring does nothing but increase fuel usage."

However, you are underfiring your Buderus by 30k BTU but are getting great fuel savings - so that is in direct opposition to what he says...

Anyway - as you state - you can get away with a reduced input BTU (smaller nozzle size) as long as you make sure:

- the stack temp remains high enough to avoid condensation (in your own situation)
- you maintain a good full flame (maybe need to adjust the nozzle type too as well as size)
- watch CO levels (but a proper stack temp should negate that)
This should all be done using a combustion analyzer...

So a WS-4 with a factory .90 firing rate (.65 @ 190psi) can probably work just fine dropping down to a .77 firing rate (.55 @ 190 psi) yielding a savings of about 14%, especially if the boiler is slightly oversized to the heat loss right now (to account for a future home addition)...

I'm curious about the benefits and negatives to running at reduced firing rate:

@ January 22, 2014 12:07 PM in Time Meter for Riello F5 Burner

Running the burner at lower input BTU than what the manufacturer recommends.

For the WS-3 with NX the spec is a .75 gph firing rate for 105k btu input/hour. Am I correct to say that for #2 oil at 138,500 btu x .75 firing rate = 104k btu is how they arrive at this input?

So you are putting in .55 gph x 138,500 = 76k btu input/hour or 30k btu less. Besides the reduction of .2 gph in fuel use - what other benefits are derived from making this change...longer more efficient run times? What are the potential negatives? How low can you go before there is a problem? Is this based on stack temperature - you can go as low as +/- 325 degrees stack and run the boiler safe and efficient?

Thanks for the insight...

Of course it's all relative to...

@ January 21, 2014 7:00 PM in Time Meter for Riello F5 Burner

house size ;-)...

and the .55 nozzle - at a 190 psi, it's more like .75gph.

if there are 2 wires coming out of the counter then...

@ January 20, 2014 5:02 PM in Time Meter for Riello F5 Burner

which of the wires goes to B1 and do any go to B2?
thanks again.
YES - the logamatic is the king of controls!!!

would this work - looking to do the same thing?

@ January 20, 2014 3:09 PM in Time Meter for Riello F5 Burner

Just purchased Buderus WS-4 and Riello F5 with Fuel Smart Hydrostat 3250plus.
Surprised that with all this new equipment there is no run time information.

Would a ENM T39 Dual Hour Meter/Counter Combo do the trick for me?

Tracking run time is the main info and the counter will tell me how to account for the purge time...

How do I install this equipment - at the Hydrostat or at the Riello connection?

Here is the pdf info for the meter/counter:

Any help appreciated. Thanks.

where does this get connected

@ January 20, 2014 12:14 PM in BTU Meter

Hi - I have a Riello burner working a Buderus.
Want to watch my runtime and was shocked to see that a runtime meter is not included with the Fuel Smart Hydrostat 3250 plus control unit.
If this is a simple solution - where does it get wired into the system?

Ok - understood

@ January 20, 2014 8:58 AM in Why would i want a mixing valve for my indirect hwh?


Why would i want a mixing valve for my indirect hwh?

@ January 19, 2014 8:05 PM in Why would i want a mixing valve for my indirect hwh?

recently installed Buderus WS-4 and S32 indirect.
the indirect's heat demand is being driven by it's Honeywell aquastat which I had them set to 140 degrees.
why would i additionally need a mixer off the boiler to feed the indirect? does that save fuel usage? does the lower temp used with the mixer reduce the recovery?

do a heat loss calc...

@ January 19, 2014 7:35 PM in Boiler Correct Size

I'm NO expert but just went through a new install myself. Did a lot of research and got smart fast. You should do a heat loss calc - there is a cool one you can use with a smart phone from slant fin.
You are definitely over sized. I have a 2,700 sq ft ranch with a 1,000 sq ft finished bsmt (but i keep the bsmt at 60 degrees). I just got a Buderus WS-4 which some may say is over sized for me at 95,000 net btu but I bought it to accommodate a potential 600 sq ft upstairs addition. i came off a 1984 125k weil mclain. you should bring that installer back and have it swapped out.

From old to new oil setup - a great transformation

@ January 19, 2014 4:08 PM in From old to new oil setup - a great transformation

Finally bit the bullet and upgraded from a 1984 Weil 125k net Btu + direct fired 50 gal hw heater to a brand new Buderus G115WS-4 with Riello F5, S32 indirect hw heater, Fuel Smart Hydrostat 3250-plus, Tigerloop ultra. 4 zones heat + the indirect. 2700 sqft ranch plus 1000 sq ft heated bsmt. The WS-4 gives enough firepower to handle a 600 sqft master BR addition upstairs if desired by me or the next owner. Was using about 1500 gals/year...hope to see nice payback.
Thanks for all the insight I gleaned from this and some other forums...

Here are the before and after...