Expert: Stephen Major (Owner--Major Design Group) - 5/29/2007

Question
I am in the early stages of building a 28' x 42' all year cabin in northern Wisconsin. I have two general questions: 1. What is your opinion regarding using potable Wirsbo tubing for domestic water plumbing. I've heard that it's easy to install, very reliable, and won't break and leak if it freezes. Sounds like the way to go for a cabin that may be unoccupied for long periods in the winter.
2. Regarding a hot water heater for domestic use. The plan is to basically heat the water with "off-peak" electricity with current rates of 3.5 cents/kWr. The electric power company recommends a 105 gal. Marathon hot water heater. However, it costs $910. I'm sure it's a well insulated and high quality water heater, but can this cost be justified?
Thanks

Answer
Vern,

Question 1) Wirsbo PEX is a good product.  It is becoming more cost effective as copper prices rise.  It's pretty easy to install.  You need to have the right tools and fittings, of course.  But don't be misled -- all common piping (including PEX) is only freeze-resistant, not freeze-proof.  If it freezes solid when full of water it will likely burst.  If you are going to be leaving the cabin unattended for long periods in the winter, you should drain the piping and fixtures in case your heating system fails.  Plan out your pipe runs, drains, etc. for efficient draining.

Question 2) $910 is a lot of money to spend on a water heater, and I doubt you will see a rapid return on investment.  I would strongly recommend that you consider installing an on-demand tankless water heater (at half the price), such as by Bosch.  This is a good option if you have propane available.  These products are rapidly becoming the heater of choice in the seasonal home arena.  Electric on-demands are also available, but you won't be able to restict usage to off-peak hours.    If you need a tank-type electric heater I would recommend a $200-300 standard model and wrap it in a thick insulation jacket.  Don't buy one that is larger than your regular needs, and be sure to turn it off if you are going to be gone for more than a few days.

Best of luck on your project, and let me know if you have additional questions.  

--Steve Major