Anyone with a duct-u-lator?

Ryan, Run the load calculations using a R50 for the ceiling, a R19 for the walls, a R21 under the floor and a R2 for windows/doors. (The R2 is about average for a double glazed window). Use a delta T of 90 degrees and see what you get.
The R factors are currently about what the DOE is recommending.

Ryan, It's done all the time. It just may not be popular in your part of the country. Do the calculations with 30 btu per sq. ft. as a base line. Figure in all your losses on all sides of the house. You do need a house that is insulated well.

Be very carefull on the UNDER floor install. You will need to go through the btu losses of the house. You will only get a max of 30 btu's per sq. ft. The prefered method is ABOVE the sub floor (in floor). There are several IN floor retro fit methods as well as a floor system that replaces the sub flooring. The gypcrete (above floor) is now considered to have too much thermal "lag". IE: on hot to cold days/nights it takes too long to react. Even with the IN floor, supplemental fin tube in troughs may be required in front of large glass areas like sliding doors. The floor covering is also a major concern. All hydronic floor heating must have the floors insulated. Along with my Weil Mclein boiler, I plan on going with the Warmboard product which is the subfloor substitute.

well we know who has the deep pockets on here(barracuda)!! wirsbo is some pretty slick stuff and very easy to install...sorry joe, but imo those are the top two in the hvac industry..speaking of h20 tanks ..go instant hot!!!things kick ass

MM- We have a Weil McClain propane boiler and super store HW tank- The system has been very good to us since we've owned the house. From what I've been told the super store HW tanks are very efficient.
I'm with you on the hot water vs force air heat.
Rip out your radiators and retrofit some radiant under the floors We love the radiant heat!

You may want to look at this one too. It's what I'm going with and with the domestic hot water as well.

Weil-McLain® Ultra Condensing High Efficiency Gas Boiler

any questions you guys have id be more than happy to help out..how i make my living..
mark- carrier performance 90 or other models..the 90 has the cast aluminium heat exchanger and is a 90 %..trane makes both a gas and oil boilers thats just as well imo also..as barracuda stated buderus is a good product also but can be more of a pain in the ass to install due to the programming...is there a reason why you want to stay with the boiler set-up? complete systems are cheaper going with forced air(if adding a/c).

Question for you HVAC guys. I need a new boiler for my house (baseboard heat). I am looking at Slant Fin boilers. What's the word on these? It's replacing a 40+ yo Peerless boiler and I thought that I wanted to replace it with a Peerless but now I don't know.

pete, My buddy says 145 cfm, and this is figured 3.00 x 14. he could not figure on the 3.25 but this is what he would use as a benchmark. this is roughly the same as 6.5 in. round.......
Hope this helped,he called at 8:30 and yes he was on a boat, catching Red Fish, and yes he limited out............