cross use of water heater

heatguy

bidding on job in nj 6 family historic apt. building in trenton.my competition is proposing using hot water heater for domestic hot water and space heating with no seperation of domestic and heat .i believe this is against code but not sure where to find code # to quote any help would be appreciated.

Derheatmeister

If it is not in the code, then the people that are resposible for such a install should be liable for any consequences if some one gets sick or even dies! The Installer of such a system need to be educated about this! Maybe he does not know . If he does know, Then maybe he sould subject himself to such a system ! Then he may not be able to install systems like this in the Future.BTW in germany that is not to code, but we are not in germany! good luck finding the code. it may apply in your area. if not maybe someone needs to get sick/die first, someone needs to sue, Doctors/Attorney's need to get involved then maybe then the code will change. HM.

dblagent007

See Section M2004 of the attached file for NJ's code on this.

Here is the full NJ code:
http://www2.iccsafe.org/states/newjersey/NJ_Residential/Residential_Frameset.htm

Jack

All this

type of system design is...is cheaper, not better, IMHO. Value engineering is good. Cheap engineering isn't...again, IMHO

[Deleted User]

wow, i'd'a never thought it!

but reading that code excerpt, it appears to be ok to do it

Derheatmeister

Hey Heatguy how about sending a letter to them State to them that you decline such a installation(Deni the job or the way it's Specked!)? . Maybe write also that you Cannot and will not be able to compete against this corner cutting Hazard of a system .It may put you on top... Or you may loose the job. but you may be able to sleep better at night. Good luck Richard from Heatmeister.

[Deleted User]

and.......

in the '03 ipc, chap 5, sec 501.2, it's legal, as long as the the potable water is kept at, or below, 140deg with an approved, asse 1017, t-stat mixing valve. and that the potability of the water be maintained throughout the system

[Deleted User]

Hopefully....

these building officials will come to their sense's within the next year or so...

Just tell them to google legionella. If they don't believe the Center for Disease COntrol, who WILL they trust?

ME

[Deleted User]

i don't know mark

if this is so;

70 to 80 °C (158 to 176 °F) - Disinfection range
At 66 °C (151 °F) - Legionellae die within 2 minutes
At 60 °C (140 °F) - Legionellae die within 32 minutes
At 55 °C (131 °F) - Legionellae die within 5 to 6 hours
50 to 55 °C (122 to 131 °F) - They can survive but do not multiply
20 to 50 °C (68 to 122 °F)- Legionellae growth range
35 to 46 °C (95 to 115 °F) - Ideal growth range
Below 20 °C (68 °F) - Legionellae can survive but are dormant

then a potable/heating system would make sense. no?

jp_2

Mike,

most important to know, what is the "rate" of growth?

and at what amounts(population) are consider harmful?

[Deleted User]

well, according to the chart

70 to 80 °C (158 to 176 °F) - Disinfection range At 66 °C (151 °F) - Legionellae die within 2 minutes At 60 °C (140 °F)
and since it appears to only be a problem with the elderly or a compromised immune system. not to poo-poo them. then it'd be no different than drinking hot water from your water heater, except for the amount of pipe the water would go through