Other interesting resources you may find helpful:

 

Radiant Floor Technical Questions Answered Free:

http://en.allexperts.com/q/Radiant-Floor-Heating-3710/

 

This is the software I use to calculate the optimum size of your boiler:

http://www.wrightsoft.com/products/right-suite_universal.aspx

 

Here is some good information on sizing boilers:

http://www.energysavers.gov/your_home/space_heating_cooling/index.cfm/mytopic=12340

 

Here is the best resource for radiant floor heating (and cooling):

http://www.radiantpanelassociation.org/

 

Here is an excellent resource on the benefits of hot water heat:

http://www.healthyheating.com/home-heating-system-design.htm

 

Here is some good background information on high efficiency condensing boilers:

http://www.house-energy.com/Boilers/Condensing-Types.htm
http://hpac.com/heating/selecting_small_condensing_boilers/

http://www.mnshi.umn.edu/kb/scale/boilers.html

 

Here is some good background information on condensing water heaters:

http://www.aceee.org/consumer/water-heating
http://www.energystar.gov/index.cfm?fuseaction=find_a_product.showProductGroup&pgw_code=WHC

 

Here is a potential option for financing a project in an emergency:

http://www.myprojectloan.com/offers/