[Greenbuilding] Radiant heat/DHW for a 400 SF in-law unit - recommendations?

[Alchemy Construction Inc]

   [1]http://taco-hvac.com/en/products/Radiant+Systems/products.html?current_ca
   tegory=61
   The x pump block controls water temperature by either a setpoint,  Delta T
   or outdoor reset.
   The Radiant Mixing Block does the same without the heat exchanger.
   Both Include air elimination.
   Not a big marketing push by HTP at the moment but their new Phoenix water
   heaters are Modulating /condensing water heaters.  PVC vented, thus low
   exhaust temps. High efficiencies with the added benefit of tank storage to
   fully tap solar harvesting and micro zoning, while able to handle sustained
   flue gas condensation all day long, unlike flash heaters.
   The new Takagi TK3's must be vented with Stainless venting along with the
   Noritz  line.   I'm  guessing  they  are addressing sustained flue gas
   condensation problems......
   Sincerely,
--
Stephen Bohner
Alchemy Construction Inc.
[2]www.alchemyinc.com
707-822-8013

   Keith Winston wrote:

I imagine you're talking about the double-pumped-flat-plate-exchanger in
a package by Taco? Is it called an X Block? I've just started seeing
them listed, never seen one -- what do they go for? That pre-packaged
stuff tends to be expensive... Of course, the time savings... You
directed us to the Taco site, but I couldn't find what product you were
pointing out (you just gave a general address). What does Taco call it?

Why do you say that about the Phoenix? I can't see what it has that's
new? Nor can I find hardly any information on the web: apparently it's
made by Heat Transfer Products, the Munchkin manufacturer, but they
don't list it on their website. Phoenix also makes a rather
standard-appearing oil tank water heater. I just don't understand why
this has come up twice in 2 days, is Phoenix doing a big marketing push
right now or something?

Keith


Alchemy Construction Inc wrote:


An X Block tied to their hot water heater or
an X Block tied to a solar hot water tank or
or an x block tied to a new Phoenix water heater.
that's in order of pricing hot water heater being cheapest

The x block works great for smaller heating loads.
[3]http://www.taco-hvac.com/
The New Phoenix water heater is going to fill a large hole in combined
hydronic heating.....
Sincerely,

References

   1. http://taco-hvac.com/en/products/Radiant+Systems/products.html?current_category=61
   2. http://www.alchemyinc.com/
   3. http://www.taco-hvac.com/