I'm installing the piping for a SS140 Wood Gun and wondering whether to use a manual or automatic mixing valve? If manual, can I get by with a ball valve? Seems to me that if I need 9.4 gpm to get the 140,000 btu a ball valve throttled to provide the 160* return would be easier and much cheaper than a manual mixing valve. Ball valve - $12. Manual mixing valve - $85. Also, what's the benefit of using an automatic valve at ~$350?
Any thoughts?
Any thoughts?