I think I am with in the guide lines. I have been searching in the forumn and can't find the answers to a few questions. So far the salesman have not been much help.
1) Which furnace or a different one all together? Is it worth the $582 to get the G71 over the G61 ?
2) The furnace and HWT now share the same 6 inch exhaust vent with only the new HWT using this vent does the vent need a liner?
3) The house is on metered water so do I need a Thermal Expansion tank and a back flow valve at the tank and or knock arrestors installed at the tank. We have had some pipe knock in the kitchen so will this help?
4) Should the gas shut off's on both the furnace line and HWT line be replaced.
Our house was built in 1984 making it about 24 years old. As far as we can tell it has the original Furnace ( Airco GS-80 ) and we have no age on the Hot Water tank but its at least 15-16 years old. The whole house is about 2200 sq ft with the main floor being about 1100. The upstairs is heated by electric heat. Our gas bills are $174 a month on the budget for heat and hot water. The house has a return air vent on the main floor and one on the second floor. There are 8 duct vents in various rooms on the main floor. we have no air conditioning, no venting to the top floor where the bedrooms are.
The furnace is nosey and about a year or two ago we had trouble keeping the pilot light lit. After about 3-4 service calls someone was able to keep it going. There answer then was to get a new furnace. Furnace is in the 4 foot crawl space.
At the moment we can receive several grants if we go to a 95% efficient furnace with the DC variable speed motor. ($1280 in grants). We need to pay $300 for a before and after house evaluation to be eligible as well. They look at all aspects of energy saving as well as the furnace.
We could buy a Lennox G71 for XXXX installed. Top of the residential Lennox line-up.
For $582 less we can get the G61 installed, second banana, I'm ok with that.
We have had three quotes all from salesman with different answers and methods. One connects using rubber membrane (sound break) another sheet metal only.
We get no grants for the HWT but its old and while they are there we could get it done. We would go from a 40 gal to a 50 gal so the jetted tub could now be used. At the moment the tank is in a metal tray with a hole in the floor. If the tank blows all the water goes into the crawl space where we have lots of stuff stored. While they are there we want them to connect to a drain so this doesn't happen.
With this furnace type we need a drain in the crawl space for condensation, which we don't have, or a pump. They say they will try to install a trap in existing plumbing near the furnace and it may or may not need a pump. We would like the HWT to connect to this as well.