Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
Does baseboard loop from condensate return add to boiler BTU
I have a customer who has a two hundred thousand BTU boiler.They have about 50 to 70 thousand that they need for two baseboard loops I want to add an everhot tankless unit to accomplish this. Does it subtract from the boilers BTUs thanks Joseph HHI services
This is steam, I presume? What is the EDR load of the system without the baseboard units? What is the EDR rating of the boiler (sorry, but "two hundred thousand BTU boiler" just isn't useful information -- is that gross input? Net output?).
If the EDR load of the system and the EDR rating of the boiler are similar, or if the boiler is oversized, then you should have no problem with the baseboard loops. They don't feed off the condensate line, though -- they come off the boiler itself below the water line. They can return to the condensate line.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0
But the hot water load should not exceed the piping & pickup load for the boiler which is 33% of the boiler output0
Ed Im curious to understand is this special specifically to steam or would it be true by forced hot water if I'm using a 15 percent pickup factor also if they removed some of the steam radiators so that this boiler is oversized then I'm assuming I would have even more BTU available for hot water loop is that correct0
This only applies to steam,
Lets say a steam boiler has a net rating of 833 EDR/sq ft of steam radiation or about 200,000 BTUs
which is 833 x 240 btus/square foot 833 x 240=199,920
200,000 x 1.33 piping and pickup=266,000 so that leaves you 66,000 you can use for the hot water load maximum
Assuming the boiler is 80% efficient (266,000 /.80)=332,500 would be the boiler input.
Their are some other losses like heat lost through the jackett but the above is pretty close
So in the above example, 332,500 is input, 266,000 is gross output, 66,000 is the pick up load used to preheat piping and 200,000 would be the amount of radiation that can be connected
So a steam boiler is "oversized" by the PU factor of 1.33. The .33 can be used for a HW loop but if you use more than that the boiler may not be able to heat the connected load.0
- 121.3K All Categories
- 84K THE MAIN WALL
- 2.9K A-C, Heat Pumps & Refrigeration
- 53 Biomass
- 417 Carbon Monoxide Awareness
- 40 Chimneys & Flues
- 1.7K Domestic Hot Water
- 4.8K Gas Heating
- 119 Geothermal
- 155 Indoor-Air Quality
- 3K Oil Heating
- 56 Pipe Deterioration
- 772 Plumbing
- 5.4K Radiant Heating
- 362 Solar
- 14K Strictly Steam
- 3K Thermostats and Controls
- 51 Water Quality
- 627 Buy, Sell, Barter
- 38 Industry Classes
- 73 Job Opportunities
- 19 Recall Announcements