Joined on October 17, 2010
Last Post on February 14, 2014
@ April 2, 2012 9:14 PM in Do I need a boiler with a coil if I buy an indirect water tankCast Iron has its place. More so than low mass problematic mod/cons. Your claims are not supported. The MPO is an excellent choice in this application.
As to Ron's post about real world numbers, try saving 200 gallons over a heat season by switching from a single pass, top flue pinner (New Yorker Cast Iron 3 section with tankless coil) to a Buderus G115/21 with an indirect. One of my customers from 2 years ago did. This is in Eastern Maine with a -10 design temp. Will that happen every time? I don't know. But it did here.
@ April 1, 2012 2:09 PM in Replacing old oil boilerFollow the above advice. It is spot on.
To FurnaceFighter, most of the Mod/Cons from Europe are limited to 174 deg F. That number is not adjustable. Viessmann Vitodens 200 is limited to 167. As you stated, the biggest drawback is that the mod/con is not very efficient at higher operating temps.
I have had two residential and a handful of commercial projects recently where bid-spec buildings were built with exactly the amount of high temp radiation needed at design condition.
On one of these jobs, the contractor that did the change out used a Vitodens 200 (which is my favorite mod/con, hands down). The customer complained of not making setpoint in the dead of winter. We made some minor adjustments and made the system constant circ and that helped a lot. We added additional radiation the following summer.
These were extreme cases, but highlights the need to have a proper heat loss done and compare that with the actual radiation in place.
@ April 1, 2012 2:03 PM in Peerless WV-05 conversion to gasPeerless is the boiler manufacturer. Any burner that is put on their boiler, must be approved by them to continue its Listing. All central heating appliances must be Listed, by UL or CSA or .... So a phone call to them could save you the hassle.
By contacting them, they can tell you if that boiler was tested with a gas power burner and if so, which one.
@ April 1, 2012 7:52 AM in Peerless WV-05 conversion to gasOil to Gas conversions are not DIY projects at all. Please do not try this yourself.
As for whether your equipment is a candidate for conversion, your technician can obtain that information from Peerless. They will give him the proper conversion burner and any pertinent setup data for the change over.
@ April 1, 2012 7:48 AM in Boiler making loud noise when filling storage tankI assume you are refering to the indirect Domestic Water Heater tank. There are a few things that could be causing this and most of them are water flow related. Can you take some pictures of your boiler and the associated piping and post them here. Then we could try and assist you.
@ March 31, 2012 9:35 PM in Modulation Range - Burnham AlpineThe modulation range of negative pressure gas systems is determined by the minimum allowable fan speed. Most of the fans can't be run below 20% of full HZ. Thus the industry standard of 5 to 1 turn down ratios.
IBC had a boiler with a 10 to 1 turndown, but I am not sure what they were doing different.
A buffer tank or true hydronic separation is your best option.
@ March 31, 2012 6:30 PM in BIASI BOILER/ClearanceIn the state of Maine it is 18" from the surface of the smoke pipe to any combustible surface. Straight line measurement. This is for single wall smoke pipe.
@ March 30, 2012 9:35 PM in Small oil boilerThe specs that they are writing for these grants aren't met by the pinners. Only the 3 passers will meet it.
I have been using the Burnham MPO. Not my absolute favorite boiler, but one of the better ones.
I have been looking at the Peerless Cast 92-2 and 92-4's for my gas "Buy America" jobs. That and the Hydrotherm KN series. They are essentially the same boiler, but the Hydrotherm gives me a higher range, going up to 3 million.
@ March 30, 2012 10:37 AM in Mega SteamI actually saw one of your Mod/Cons rocking and rolling due to misapplication yesterday. It was a 501. Scares the hell out of you for a few seconds.
Nice work Dan.
@ March 30, 2012 10:32 AM in New HTP installJust a bit of advice.
If this is a high temp application, (160 - 180 deg F) then pay special attention to maintenance of the heat exchanger. We are seeing some issues in the oldest versions of these that were run in that temp band for the bulk of their life.
I agree, easy to program and install. I have become nervous in the last 6 months after seeing some of the previously mentioned issues.
@ March 29, 2012 8:45 PM in CapacitorsOur vans stock a list pretty similar to James'. We don't keep 5's on the truck and maybe only one or two 7.5 for blower motors. Most of our stuff is large commercial and institutional. I like the multi taps, but don't completely trust them. We use them to get out of a jam, but always replace them with the correct cap as soon as we can get one.
@ March 29, 2012 8:29 PM in Small oil boilerMost of the state jobs that I am seeing these days are grant funded through the "Buy America Act". I looked at a job the other day where one of the European boilers would have been an absolutely perfect fit. Couldn't use it. Didn't get the job anyway. Oh well. Win some. Loss some.
I would look at the Burnham myself.
@ March 13, 2012 8:43 PM in converting to 410aIt is all ACR tubing. The concern is whether there are soft soldered joints in the piping. Aside from that, follow furnacefighters advice. He is spot on.
@ March 12, 2012 6:42 PM in Common venting for mod- con boilers?SWEI is correct. It has to do with the listing.
If the manufacturer had it tested by UL or CSA with common venting then yes. If not then no. Check with your manufacturer.
@ March 12, 2012 6:37 PM in Peerless Cast 92-2/4You are correct with the lower btu models. i have heard of some issues on the larger ones. I have a colleague that has a couple 399's that he is started to get concerned about.
The inherent problem lies in the lack of a thermal mass to distribute the heat in the heat exchanger. A burner large enough to fire at half a million btus puts an incredible strain on the heat exchanger when subjected to the high end of the temperature band over the bulk of its life.
I am going to visit a site with 18 Hydrotherm KN's on Thursday. These have been up and running for a while and I am interested to talk to the guy that maintains them.
I will let you know.
@ March 11, 2012 7:28 PM in Peerless Cast 92-2/4I do a lot of 10,000+ sq ft high end residential and commercial. (As well as some large institutional work.) I have used the Elite's and Knights in the past with good results. However, I recently have seen some issues with the Gianonni's when subjected to high temps for extended periods.
The smaller boilers seem fine, it is the large ones, 200-600K that are showing the problems. I am searching for a solid retrofit boiler with modulation that can handle 180 design temps.
@ March 11, 2012 5:43 PM in boiler choice timeIn your original post you stated that a heat loss calc gave you 138,000. Was one done?
I misread earlier. I thought that he said he had a Texaco burner. Most of those that I see are on coal conversions. My mistake Robert. I can safely say that I have never seen a Dunkirk installed in my coverage area.
What is the OP's location?
@ March 11, 2012 5:41 PM in Peerless Cast 92-2/4Just wondering if anyone has installed any. They appear to be the same as the Hydrotherm KN series and the Ray. i am looking for a modulating boiler for high temp designed light commercial retrofit applications.
I am seeing some ugly things on some older Elite's and Knight's that were run at the higher end of the temperature band for extended periods of time.
Input is appreciated.
@ March 11, 2012 5:00 PM in boiler choice timeRobert, I frequently have heat loss calcs reveal 42-43 btu/sq ft on old houses up here. With an old Texaco Chief, I would fair to guess that the house is at least 100 yrs old.
I don't think that his heat loss is that high if he is in an area with a -6 to -10 design temp.