Joined on November 26, 2011
Last Post on July 28, 2014
@ March 13, 2013 11:21 AM in Advice on repl DWH + bb WH, in Illinoisabout how many kWH do you burn in a year for heating, and what does that cost you per year?
Do you have a heat loss calculation for the building? This is critical in order size the boiler correctly.
What kind of shower heads are in use? How many at one time? 75k 75 gallon is quite large for a residence. I'm guessing its performance has dropped a bit over the years.
@ March 13, 2013 10:31 AM in Backup boiler piping for solar drainback systemPosting here because it's more of a boiler question than a solar question. Existing drainback solar system with 800 gallon nonpressurized tank. Tank has two copper HX coils, one for DHW and one for space heat. Space heat is currently direct piped out of HX to floors with no ODR. Barrier tubing embedded in concrete on ground level, suspended below (not touching subfloor) of 2nd level. Backup heat comes from a W-M CGi on LP using manual changeover valves to redirect the boiler output from the floors to the tank. Needless to say, it's been giving the owner fits for the entire 13 years since it was built.
We are tearing off the ground floor ceilings and installing Watts FlexPlates on the existing PEX (8" on centers.) I plan to install separate motorized ODR-controlled mixing valves for each floor. Still looking at control options but the question at hand is the best method of piping in the boiler. We want long boiler run times, storing whatever is not needed for the floors in the tank.
Since the tank is an open system we have to work with the existing HX coils (no way to add a third since the tank is located on the other side of the house from the boiler room.) I'm thinking about injecting the boiler water between the HX output and the hot side of the mixing valves, then allowing any excess to go back into the HX and heat up the tank, but not quite clear on the best way to do this. I could add motorized three-way valves on either side of the HX coil but I suspect there's probably a simpler way.
@ March 13, 2013 10:01 AM in Oil to gas conversionHenry Hub and City Gate prices matter to traders, but are best vaguely related to what you will actually end up paying, thanks mostly to hedging and long-term contract prices negotiated months or even years before you use the gas. The utility will have historical rate information on file which is slightly more interesting, but still of limited usefulness for predicting your future costs.
As a consumer all you really need to know is what the bottom line will be. Find a neighbor or three with similar-sized houses and ask to see a couple months worth of bills. Just look at the total cost in dollars and divide by the number of therms used that month. I try for an average of at least three winter months when making projections, then add a ramp to that in anticipation of future price increases.
@ March 13, 2013 9:53 AM in propane wall mount boilerTi 150 puts out 136k - what is your building heat loss? I'm pretty certain it's not 45 BTUs/sq ft. The best boiler is the one that is properly sized and installed for your application. The installer is actually the most important component of your system. Unless there is something fundamentally un-fixable about that boiler, I'd be looking to make it work properly long before I replaced it.
FYI, as a matter of policy we don't discuss price here.
@ March 13, 2013 12:44 AM in pex on condensate loopif properly done will hold 100 PSI for a week. Don't worry about them. A thermostatic mixing valve might be in order - set as low as needed to heat the zone. I'd probably use copper from the hot port back to the boiler.
@ March 12, 2013 11:42 PM in unusual use for a cast iron radiatorOptimal tank sizing varies a bit with species, moisture content, and combustion technology, but is definitely worth the time to get right.
@ March 12, 2013 5:18 PM in Replacing expansion tankCould just be a bad Schrader valve. Try replacing the stem.
@ March 12, 2013 1:06 PM in Flow Meter Recommendations-Can't you set this using ∆T with the boiler on high fire?
@ March 12, 2013 12:48 PM in Oil to gas conversionThe bottom line on the bill by the number of therms and you'll get a net cost per therm. It's best to look at 2-3 months and average them.
@ March 12, 2013 12:42 AM in Oil to gas conversionMath here http://www.eia.gov/neic/experts/heatcalc.xls
Predictions being worth less than you pay for them, I would have to guess that liquid fuel prices are not likely to drop much anytime soon. NG? Who the blank knows, but even a steady uptrend would take years to become a major economic issue for most of us.
@ March 11, 2013 6:12 PM in Looking for plumbing tool that is no longer madehttp://www.moellermarine.com/sites/moellermarine/files/flanging-tool.pdf
@ March 10, 2013 10:23 PM in HBCDI should have known there would be something like this.
BTW, I have a question about the "closed cell" label. I've been told that EPS and XPS are 100% closed cell, while polyiso is 90% or 95% closed. Anyone have more info?
I've had my hands (and nose) on 25 year waterlogged walk-in panels and I've seen 40+ year old XPS dock floats that are still floating.
Think I'll stick with damp-spray cellulose above ground.
@ March 10, 2013 5:58 PM in Garage Slab Thermal Breakin XPS are about as minimal as you can get for a polymer. I'd worry more about polyurethane or polyiso.
@ March 10, 2013 5:46 PM in Confused about converting to Gasjust responding to the listed candidates, all of which were massively oversized.
Lochinvar WHN 055 offers higher turndown than the PTS 60.
Contender doesn't include ODR as I recall. I believe the Cadet does, though I've yet to actually see one. I'm going to call them in the morning and see what I can learn.
@ March 10, 2013 5:34 PM in Sunboard Radiant Heat PanelsIf you decide on floor heat, isolate or you'll spend about a third of your fuel heating dirt.
@ March 10, 2013 4:13 PM in do u know what this is?Thanks. I was actually curious about performance of the different ceiling systems/plates.
@ March 10, 2013 4:11 PM in Confused about converting to GasWould lead me towards a TT PTS 60 or a GA124/17. A larger indirect might be in order.
@ March 10, 2013 4:06 PM in Garage Slab Thermal BreakMarch issue had the second part of something called "Together Forever" -- was that it?
@ March 10, 2013 12:15 PM in Garage Slab Thermal Breakvacancy sensor might work there.
Have you seen the new Broan Ultra?
@ March 10, 2013 12:09 PM in Noobremember to account for the drop in water temp -- baseboard will need to get longer and longer as you move down the line.
@ March 10, 2013 11:58 AM in do u know what this is?any insights to share there?
@ March 9, 2013 11:30 PM in Garage Slab Thermal Breakhttp://www.ftc.gov/opa/2009/03/rvalue.shtm is worth a read.