Joined on November 26, 2011
Last Post on March 9, 2014
@ January 1, 2013 11:01 AM in Need help - was holding temp but now it can'ttells you air temperature. What is the supply water temp coming out of the boiler?
How hard is your water? Scale can drastically reduce the capacity of the boiler's heat exchanger (and shorten its life.)
@ January 1, 2013 9:52 AM in Heat loss calcMeans lower water temps, which produce higher efficiency with a mod/con boiler. Upsize where you can, but pay attention to balance. If you upsize all but two rooms you are going to have comfort issues. Don't be afraid to specify different indoor temps for some spaces. Bedrooms with elderly or infants living in them and bathrooms will benefit from a little more output. I typically spec those at 72-75F when the rest of the house is at 68F. Infrequently occupied spaces like workshops or basements can be quite a bit lower in many cases.
@ December 31, 2012 7:46 PM in $50 if you can figure this out...got a nice laugh out of that one!
@ December 31, 2012 12:52 PM in Oversized Boiler?offer them an olive branch by accepting a less expensive EG-40 instead.
@ December 31, 2012 11:28 AM in combi heat dhw gasSo much better to clearly define expectations before meeting them (and then being accused of not doing so.)
A 199k tankless (or two) can support a soaker tub nicely when space heat loads are minimal.
@ December 31, 2012 11:11 AM in New steam control principleand compute an average. Single-pane windows will really drag that number down on a cold night.
Measuring the little house where we are currently staying one recent night, I got the following temps:
73.8F interior partition wall with the stat (south end of that room)
68.5F east facing wall with front door
67.2F west facing wall
66.6F north facing wall between two large steel casement corner windows.
52.4F north facing casement window
@ December 31, 2012 10:28 AM in New steam control principleThermostats measure air temperature.
At least 50% of the body's temperature perception is radiant. Get an infrared thermometer and point it at the walls, windows, ceiling, and floor next time she's cold. I suspect you will come to understand more about your house and its heating system.
@ December 31, 2012 10:16 AM in district steamhttp://www.seattlesteam.com/about-district-energy.htm
@ December 31, 2012 9:59 AM in combi heat dhw gasPlenty of wall hung condensing boilers out there, a number of which I feel comfortable recommending (Triangle Tube, Lochinvar WHN, Viessmann.) If the DHW demand is at all significant, an indirect water heater is the best solution. Keep the pump or diverter valve and associated wiring above the projected flood line and you should be OK.
Combi boilers without a tank are going to suffer in terms of first hour delivery, and frequently end up significantly oversized for the heating load. You can add a buffer tank, but a properly sized indirect with a properly sized boiler is best. If there are giant soaker tubs or mega-showers involved, a second boiler or a tankless WH may be in order.
@ December 30, 2012 10:37 PM in Gas pipe sizingcode requires them at all appliances which do not have internal sediment traps. No mention of vertical runs.
What the code doesn't say (but some inspectors do) is that locating the gas cock upstream of the trap will allow the trap to be emptied without shutting the whole building down.
@ December 30, 2012 10:23 PM in Need help - was holding temp but now it can'tAll of the currently available Thermolec boilers have onboard ORC.
Can't speak to the older stuff.
@ December 30, 2012 9:07 PM in district steamAlso has an impressive deep water district cooling system.
@ December 30, 2012 3:08 PM in district steamI've been looking at mini districts for awhile and think they have great potential. Small, tight houses just don't have a lot of equipment options here in the US.
@ December 30, 2012 3:04 PM in New steam control principleMicroprocessors running software written or tailored specifically for the building and tasks.
Most commonly found in large commercial and industrial settings.
@ December 30, 2012 12:02 PM in New steam control principleCan handle easily this, and more. Think of a reset algorithm that takes into account wind speed, multiple OAT sensors (to predict demand in specific building areas), and even weather forecasts.
@ December 30, 2012 11:01 AM in New steam control principlebut an outdoor air temperature sensor is almost always installed on a north wall. Here in the southwest, we sometimes put them on a northeast corner, which allows them to anticipate mid-morning sun before it comes streaming in and overheats the space.
An uninsulated building leaks more heat to the outside, which could increase the measured temp above actual ambient (lowering the heat delivery rate.)
@ December 30, 2012 10:43 AM in Gas pipe sizingusually after the first drop in the house.
@ December 29, 2012 3:00 PM in Pressuretrols working with Heat Timersfix the venting and work on balance first. Once you get the pressure down to where it should be (several variables come into play on that) you can take look at the control strategies.
Post some photos of the boiler and the near-boiler piping. Get multiple angles and include any main vents.
@ December 29, 2012 2:36 PM in boiler vs tankless HVACis there a problem with the existing boiler?
@ December 29, 2012 11:29 AM in Pressuretrols working with Heat Timersthen the Pressuretrol (and any thermostats, if they are wired in the same circuit) become in effect high limit controls. If the outdoor-reset controlled timer is set perfectly they may never actually trip. With the Pressuretrol set at 5 PSI, what pressure does the system have at the end of a cycle, when the timer kicks it off?
@ December 29, 2012 10:52 AM in Pressuretrols working with Heat Timersso both have to be "on" in order for the boiler to fire. How's the indoor temp?
@ December 29, 2012 10:40 AM in NEED SOME HELPNeeds to be done properly before you spend any money. This starts with what is called a heat loss calculation -- an estimate of how much heat will be required on the coldest day you are likely to encounter in that area. Next comes an estimate of the domestic hot water requirements. These two together determine the sizing of both the boiler and the indirect. Any contractor who does not go through this process is not someone you want to hire.
You do need some help. Where are you located?