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


Joined on November 26, 2011

Last Post on July 28, 2014

Contact User

Recent Posts

you just asked this in three forums

@ January 9, 2013 10:12 AM in Tankless gas water heater question


constant cirulation

@ January 9, 2013 9:35 AM in Towel Warmer Controls and Zoning

We don't turn smart cirs on and off with the boiler, so there is always some flow in the system.

softener cartridges

@ January 9, 2013 9:31 AM in gauge glass erosion

Are available from all the major filter makers - Pentek, Culligan, etc. to fit standard housings.  They work well for point-of-use apps like dishwashers.

to pump or not to pump

@ January 8, 2013 11:48 PM in Hot water boiler sizing..

ThermoMix assumes you have a boiler circ already, ThermoBloc includes one.  I have not looked at the pump curves,

off thermostat

@ January 8, 2013 11:35 PM in Towel Warmer Controls and Zoning

We plumb them directly off the main loop, bypassing any room/zone stats or valves.  The manual valve they come with works just fine.  Outdoor reset keeps them from going crazy.

boiler protection valve

@ January 8, 2013 1:24 PM in Hot water boiler sizing..

Caleffi 280 ThermoMix is the one you want

outdoor reset

@ January 8, 2013 1:21 PM in Hot water boiler sizing..

varies the supply water temperature based on the outdoor air temp.  The intent is to deliver just the right amount of heat necessary to offset the building envelope losses.  It delivers superior comfort and efficiency.  Mod/con boilers come already equipped for it, since they can vary their output temps by design.  ORC on a conventional boiler typically requires an additional pump and often a buffer tank.


@ January 8, 2013 12:53 PM in Hot water boiler sizing..

Best bet would be an ESBE or Caleffi thermostatic boiler protection valve.

No need for outdoor reset?

BTU load

@ January 8, 2013 11:52 AM in Boiler sizing with EZ gas/intrepid

Is that a heat loss, or a radiation survey?

if you have to save it

@ January 8, 2013 11:36 AM in Cracked radiator at vent

you could drill or grind it out carefully and (using the correct rod) weld in a new bushing, half coupling, or a weld-o-let.

baseboard load

@ January 8, 2013 11:26 AM in Hot water boiler sizing..

131 linear feet @ 600 BTU/ft = 78,600 radiation capacity (180F water, 20F ∆T.)

Once you have your heat loss calc, the water temp gets lowered until the output matches the design load.

Lower temps are good news -- a mod/con will be condensing most of the year.

glycol breaks down

@ January 7, 2013 6:11 PM in Looking for a valve

over time.  Heat accelerates the process.  Extreme heat can fry the glycol in minutes.

Glycol should be tested annually, and after any stagnation event.

additional pump

@ January 7, 2013 1:31 PM in Will this work?

Not sure exactly which diagram you were looking at, but it may have shown the mod/con tied into the secondary loop with closely spaced tees, in which case the additional pump was for the boiler, presumed to have a high head HX.  A mod/con with a low head fire-tube HX could probably be placed in series with the distribution loop, in which case I'd recommend adding bypass valves to allow boiler servicing or replacement.

An important detail that Caleffi covers well is boiler return water temp protection, to prevent condensation damage.  That and outdoor reset (motorized mixing valve or variable speed injection) are missing from most OWB installs.

tiny little thing

@ January 7, 2013 12:27 PM in Boiler identification

May have been hooked to a jacketed kettle or a piece of laundry equipment at one time.

as long as they are properly installed and cared for

@ January 7, 2013 9:51 AM in Munchkin boiler

they will perform well and last.  When they were new, an unfortunate number of installers used them as drop-in replacements for conventional cast iron boilers, which did not work out well.  Quite a few died early deaths thanks to clueless installation and lack of required annual maintenance.  The Giannoni water-tube heat exchanger on which they (and many other mod/cons) are based does not tolerate idiocy, but at this point it is well understood.

We now have a number of mod/cons available which are built around a lower restriction fire-tube heat exchanger design.  These require less pumping energy and are more tolerant of hard water.  They also need less frequent cleaning.

what boiler?

@ January 7, 2013 12:36 AM in Wood boiler

Controls come with the boiler and are part of its listing.  The manufacturer will have a diagram.


@ January 7, 2013 12:35 AM in Hot water boiler sizing..

of the near-boiler piping, and Joe gave you some good advice.  Did you get a chance to measure the baseboard and note the type?

read up

@ January 6, 2013 4:36 PM in Will this work? will give you more info on wood-fired heat sources than most pros have.

this is a known issue in the industry

@ January 6, 2013 1:03 PM in Boilers for small apartments

The 24k load presents a challenge, as there simply aren't small enough mod/cons available here.   A modulating electric boiler will work (and requires no venting.)  

Minimum firing rate on the CC 85s is 23k.  I'd choose a TT PST60 (minimum firing rate 16k) or a Lochinvar WHN 055 (minimum firing rate 11k) for the larger apartment.  If there's room for a buffer tank in the smaller apartments it will help prevent short-cycling during shoulder seasons.

boiler water will build up a higher level thru time

@ January 6, 2013 12:43 PM in black pipe to copper - brass fittings?

other than oxygen ingress, I can't see a mechanism which would cause this.  We install ball drains or union ball drains at most material transitions anyway, so there's brass in the middle.

Like Mark, I've seen enough issues with dielectric unions that I prefer
to avoid them whenever possible.  Nonmetallic pipe is used for so much
potable water these days that it's eliminated many of the challenges we
used to encounter.

image problem

@ January 6, 2013 10:12 AM in Balancing heat

opening in a new window made it readable

quite seriously

@ January 6, 2013 9:59 AM in Determined woman

I didn't figure it out until I was about halfway through reading the third article on her site last night.  My wife and were visiting across the street -- I was helping my friend (who could not get broadband out there) look into a point to point wireless link and her place had a clear shot at downtown Ashland (where a community fiber network offers low cost high speed Internet.)  She was putting up (or had just finished, can't recall for sure) lightning rods at the time.  The 9 foot Baldwin piano was inside.  Someday I have to go back and ask a lot of questions.