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

[Alchemy Construction Inc]

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.
http://www.taco-hvac.com/
The New Phoenix water heater is going to fill a large hole in combined 
hydronic heating.....
Sincerely,

-- 
Stephen Bohner
Alchemy Construction Inc.
www.alchemyinc.com
707-822-8013



Graham Irwin wrote:
> I am currently designing a 400 SF in-law unit for a client in San 
> Anselmo, CA. It will be build on an insulated slab and constructed with 
> SIPs. The roof has excellent solar potential, but the clients are not 
> there yet budget-wise though enthusiastic about the possibility. I 
> would like to put a hydronic heating system in, and am looking for a 
> cost-effective, simple approach, so the combo tankless water heater 
> looked appealing - a tankless heater for the DHW is already needed, and 
> putting PEX in the slab would be pretty easy and leave the building 
> very "solar-ready." The big issue is that many of these systems are 
> designed for much larger buildings and we need to control cost, size 
> and complexity. The clients are looking at $400-$500 for a direct vent 
> gas heater on top of the tankless water heater cost, so I'm hoping to 
> spec something that isn't more than $1000 over the cost of a tankless 
> heater. Any thoughts or recommendations?
>
> Thanks,
> Graham
>
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