Hello, My home has a 25y.o. weil mclain furnace and a 13 y.o. GE water heater. All natural gas. The local utility was giving free quotes to do tankless water heaters. We took a quote because "why not?". They use Navien (sp?) tankles, which is stainless design, and I know they are more expensive - I think they are roughly $3500 for just the unit. So I got a quote back from them: $5800 to install one. What? $2300 for labor to install? Plus, if they remove our old HWH, the claim is that if we keep our furnace, they need to re-line the chimney to keep it to code. huh? I don't buy $2300 to install. In reality, I want a high efficiency boiler with an indirect water heater. I looked at the weil-mclain untra 3 with their 40 gallon indirect. Online, the prices are roughly $4500 for the whole unit, probably more like $5500 if MSRPs are used. OK, so I asked the same guy for install prices for such a system (since he admitted that he had an indirect system in his home). The estimate? $12000! OK, so I'm looking at $6500 labor? The way I figure, if a burdened rate of a plumber making $80k/yr is $100/hr, that means that I'm paying for 65 hours for labor to install? I have no zones, the run of PVC is maybe 20ft, and even removing the old stuff is straightforward in a regular, walkdown basement. So I have to ask, what is the typical cost to install a boiler, and water heater (preferably high-efficiency units, but general costs are OK)? I'm thinking that since they are giving out $1500-2000 in taxes from federal and state rebates, they are marking up the prices that much more if not more. What kind of costs (ROM) have you encountered for installing a boiler system? Note, there is no central AC to think about. Thanks!