Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

 
 
or
Submit
Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 10/16/2016

Chimney liner installers in Berks co. Pa

Had new high efficiency furnace installed leavin gas hot water heater venting up chimney alone. Was suggested I line the chimney.

Do you have the same question? Follow this Question


1 Answer

0
Votes

Because the water heater (now by itself) is relatively low discharge volume of exhaust gases, normal chimney flue or liner is too big and does not provide adequate airflow so can cause backdrafting too easy.


You need a Heating and A/C contractor (should have been the one who installed the furnace) to tell you the rated size for the flue. Actually, if you need a smaller flue for the water heater alone (a common issue), usually, for a "gravity" hot water heater putting in a chimney liner is not the way to go - commonly you either use sheet metal ducting like normal double-wall B-vent or stainless flex coil tubing for this (single-wall allowed in some areas if in brick/concrete/masonry chimney). And he should not have installed the furnace - or alernatively should not have left the water heater operational - if the existing chimney is too large for the water heater alone - that is dangerous and against code for him to do that.


Also - if a previously used wood or coal burning chimney thsat they ran the appliance exhaust up into, some areas require that the ducting be stainless steel, to resist the acids from the creosote in the chimney when it get damp - it eats up galvanized relatively quickly in some cases. Other code areas figure double-wall ducting will work OK, others require stabilizers or centralizers on the ducting (finger guides that keep the ducting from toughing the chimney wall).


Depending on how hard the chimney is to get ducting into, fairly frequently (especially with 2-story chimneys with more than one fireplace in it) it is cheaper (especially if water heater is older) to just change it out as well and replace it with a direct-vent high efficiency one also, venting directly out the wall - though that does put another commonly $1500-2000 dent in your wallet right after the several to many thousands for the furnace.

Answered 2 years ago by LCD




Related Questions


Terms Of Use
|
Privacy Policy