Tag Archives: efficiency

Tankless water heater output

Posted on June 26, 2009 by Mike Holm

I am constantly finding companies (contractors, not manufacturers) who advertise that the tankless water heater they install will give you 7-8 gpm of hot water when heating from 10C to 50C (122F). Sorry, but this  should not be believed. The … Continue reading →

Posted in Tankless Water Heaters | Tagged , , , , | 2 Comments

The importance of expansion tanks

Posted on June 13, 2009 by Mike Holm

No solar system can run without an expansion tank.  But many water boiler installers and engineers have no idea how to size an expansion tank for solar. It is often believed by many engineers and contractors new to solar that an … Continue reading →

Posted in Designing solar heating systems | Tagged | 1 Comment

Flat solar collectors verses tube collectors

Posted on June 12, 2009 by Mike Holm

There are a lot of vacuum tube collectors (i.e. solar panels) available on the market these days, and there is definitely a lot of misinformation out there. I shall try to rectify this to some extent. “Vacuum collectors are more … Continue reading →

Posted in Solar panels | Tagged , , , , , , , , , , , , , | Leave a comment

Solar water heater economics

Posted on June 10, 2009 by Mike Holm

I have about 20 years in the solar business as well as installing high efficiency boilers and floor heating. In the 90s when there was cheap gas and oil, most people who were in the solar business were true believers, … Continue reading →

Posted in Efficiency and Economics | Tagged , , , , , , , , , , , , , | 1 Comment