Colophon.
What this almanac is set in, who wrote it, who licenses it, what it cites. The bookkeeping page. If you got here you got everywhere.
Set in
- Display
- Instrument Serif · roman + italic · by Instrument
- Body
- Schibsted Grotesk · variable · by Schibsted
- Mono / data
- DM Mono · by Colophon
- Bodies served via
- Google Fonts CDN · self-hosted on cache miss
Palette · deep-winter dawn over the Bridger Range
- Indigo-graphite base
- #0E1422
- Panel
- #161E36
- Card
- #1F2D4D
- Skim-milk paper text
- #EEE7D6
- Secondary text
- #C8BFA8
- Stove ember
- #E5894A
- Frost blue
- #3F8FB2
- Sodium amber
- #E0B642
- Muted steel
- #536B7F
Authoritative bodies cited across the almanac
| Body | Domain | Where cited |
|---|---|---|
| American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) | Handbooks · standards | about, scope/snowmelt, scope/mod-con-boilers, scope/commissioning, scope/towel-warmers, scope/radiant-floor |
| Air Conditioning Contractors of America (ACCA) | Manual J · S · D · T | about, scope/radiant-floor, scope/mod-con-boilers |
| International Association of Plumbing & Mechanical Officials (IAPMO) | Uniform Plumbing Code | components/pex-and-pert |
| International Code Council (ICC) | IECC 2021 | about |
| American Society of Mechanical Engineers (ASME) | Boiler & Pressure Vessel Code, Section IV | scope/mod-con-boilers |
| ASTM International | F876 · F877 (PEX standards) | components/pex-and-pert |
| Radiant Professionals Alliance (RPA) | Member · #2614 | about, scope/radiant-floor, scope/commissioning |
| Plumbing-Heating-Cooling Contractors (PHCC) | Member | about |
| ENERGY STAR (EPA/DOE) | Boiler product specification | scope/mod-con-boilers, scope/legacy-rehabilitation |
| NOAA NCEI | Climate at a Glance · HDD | about, scope/snowmelt, daybook/january-cold-snap |
| NWS Billings (NOAA) | Local forecast office | home, daybook |
| Montana Board of Plumbers | Licensure · trade registration | about |
| City of Bozeman Historic Preservation Office | Survey · contributing-structure list | job-book/north-bozeman-1908-rehab, scope/legacy-rehabilitation |
| Bozeman Water Reclamation Facility | Condensate pH limits | scope/mod-con-boilers |
Books on the reading shelf above the workbench
- B-01Siegenthaler, John. Modern Hydronic Heating, 3rd ed., Cengage, 2011. The canonical reference. Dog-eared past the index.
- B-02Holohan, Dan. Pumping Away, Dan Holohan Associates, 1994. The book on hydronic circulator placement.
- B-03Holohan, Dan. The Lost Art of Steam Heating Revisited, 2017. For the 1920s rehab work that still has a one-pipe system in it.
- B-04ASHRAE. ASHRAE Handbook — HVAC Systems & Equipment, 2024 edition. Chapters 32, 33, 36 referenced most often.
- B-05ASHRAE. ASHRAE Handbook — HVAC Applications, 2023 edition. Chapter 51 (Snow Melting & Freeze Protection).
- B-06Caleffi. Idronics, quarterly technical journal, all issues. Free, open, on the shelf since issue 1.
- B-07ACCA. Manual J 8th edition. Residential load calculation.
- B-08Pirsig, Robert M. Zen and the Art of Motorcycle Maintenance, William Morrow, 1974. Not technical, but on Lars's shelf since 1996, and worth a re-read when the system seems to be the problem and isn't.
Licenses, insurance, and the legal shelf
- Montana Master Plumber
- PLM-MR-04217 · Lars W. Treadway · current through 2027-09-30
- Hydronic-Specialty Endorsement
- HYD-22-1004 · since 2022
- Journeyman
- PLM-JR-08145 · Kelet S. Begay
- Apprentice
- PLM-AP-21088 · Marlowe R. Krenn (year 3 of 4)
- Bond
- Surety: Western Surety · $50,000 per MT requirement
- General liability
- $2,000,000 occurrence · $4,000,000 aggregate (The Hartford)
- Workers' compensation
- Montana State Fund · current
- Vehicle insurance
- Travelers · commercial fleet
- Federal EIN
- on file with state · provided on contract execution
Manufacturers in active rotation
The complete list of manufacturers whose parts we install at scale. Picks evolve when better parts appear; the list is updated when an entry changes.
- M-01Caleffi
- M-02Uponor
- M-03Lochinvar
- M-04Triangle Tube
- M-05Viessmann
- M-06Navien
- M-07Tekmar
- M-08Taco Comfort Solutions
- M-09Grundfos
- M-10REHAU
- M-11Runtal
- M-12SWEP (brazed plate heat exchangers)
Distributor of record
We buy parts through F.W. Webb · Bozeman branch, with secondary sourcing from Murdoch's for small consumables.
Local references woven across the almanac
- City of Bozeman
- Gallatin County
- Bozeman Public Library
- Bozeman Daily Chronicle
- Streamline Bus
- Museum of the Rockies
- NorthWestern Energy
- Bridger Bowl Ski Area
- Big Sky Resort
- Heritage Builders MT
- Create Construction MT
- Pearson Design Group
- Treeline Coffee Roasters
- Wild Crumb Bakery
- Montana PBS
- Heritage Radiator Co., Anaconda
Almanac production
This site is hand-set by the shop on rainy Fridays at the workbench. Markup is hand-rolled HTML; styles are bespoke CSS with custom properties for the palette and the type scale. There is no build step, no JavaScript framework, and nothing that requires a server. The site is served from Cloudflare Workers Static Assets at plumbing-radiant-bozeman.ampifex.xyz; source is available on request.
If you find a broken link or a factual error, mail dispatch@headwatershydronics.example with the URL and the correction. We will fix it on the next Friday print.
"What we do is design, install, and commission hydronic heat and snowmelt to the load — and stay on call through the heating season for the systems we built."