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DHW

800,000 btu steam boiler being replaced. 18 unit apartment building with 22 full bathrooms and each unit has a kitchen with dishwasher. lifestyle for the occupants is nothing crazy.normal showers in morning and at night(shower heads 2.5gpm) about 15 min showers. while running dishwashers at end of the day. about 3 occupants per unit. about 50 residents in total. I'm trying to find a reliable and efficient way to provide hot water for them. which would you guys prefer? using a tankless coil with new steam boiler as a heat exchanger and run a indirect tank/s (plus would be no need for venting).... stand alone high recovery water heater ? or an external heat exchanger running off a condensate loop? I really do not want to use any tankless water heaters I have seen may break down at the worst time....I came up with 2GPM per shower multiplied by 15 minutes which equals 660 gallons first hour rating does this seem about right? this is for a peak load in morning
ASM Mechanical Company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
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Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
The sizing app will give you a defensible first hour demand number (based on ASHRAE numbers.) You and the owner can decide together to make adjustments, which can help keep you out of hot water (pun intended.)
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Absolute Mechanical Co. Inc.
www.AbsoluteMechanicalCoInc.com
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
You could add a summer boiler sized for the lower rise, which would also provide a winter boost during an extended run of design conditions.
If you go with tankless coils and plain storage tanks, you might be able to pair that with tankless water heaters sized for summer, but I'm a bit less clear on the value prop.
I have had tenants and it is bad if heat is not working, but if no DHW also that really upsets them and the phone would ring a lot with 18 units x 3 people. All this is dependent upon one heat source.
Also the best efficiency the steamer can do is mid 80%.
HW boiler or condensing water heater could reach 95% (they claim). DHW is probably a large portion of the NG bill.
That is a lot of boiler to heat the basement all summer long.
IMO.
The separate water heater would modulate to the size needed for the usage......unlike the steamer.
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Dhw coils , boilers and indirects , boilers and indirects and help from the steamer , who's on first and what's on second .
Maybe this is a fit for your project if you have room .
http://www.htproducts.com/phoenixplusspecifications.html
Langans Plumbing & Heating LLC
732-751-1560
Serving most of New Jersey, Eastern Pa .
Consultation, Design & Installation anywhere
Rich McGrath 732-581-3833
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
set tanks temperature to 160.
add sensor/aquastat to the tank outlet to cut off pump at 190.
Absolute Mechanical Co. Inc.
www.AbsoluteMechanicalCoInc.com
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
When boiler is producing steam, heating water temperature shoots over 210F, tank top overheating can happen because aquastat is usually installed in lower part of the tank. mixing valve or bypass should be installed before the pump, but i usually don't see it installed, so second control helps.
Absolute Mechanical Co. Inc.
www.AbsoluteMechanicalCoInc.com
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
When heating is off, you cannot go over 160-180F boiler aquastat setting on DHW call.
Boiler will start making steam.
better to have oversized coils.
Absolute Mechanical Co. Inc.
www.AbsoluteMechanicalCoInc.com
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Can't say it doesn't happen because I do it whenever my arthritis is bad. Transforms me from Herman Munster into a normal person. Well..........as normal as possible.
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
[email protected]
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
Either option could be wall-hung, which should save some space.
I'm not sure what value the added mass brings there with that size steamer and all the mass it already has onboard.
Interesting design and controls challenge, I agree.