How to Create Zones in a Hot-Water Heating System
In this how-to video, This Old House plumbing and heating contractor Richard Trethewey shows how to share the warmth by installing zone valves
In this video, This Old House plumbing and heating contractor Richard Trethewey explains how to create zones in a hot-water heating system.
1 Turn off cold-water line to boiler; shut the electricity to boiler.
2 Drain water from boiler, if there's no floor drain remove water with electric pump.
3 Cut copper pipe coming from boiler with a tubing cutter.
4 Use reciprocating saw to cut steel pipe, remove remaining pipe with pipe wrench.
5 Thread copper adapter into boiler to connect new copper tubing; apply both pipe sealant and Teflon tape to threads of adapter.
6 Solder together new zone valve assemblies and attach to boiler with solder-less fittings.
7 Install wireless thermostat in room of new zone; locate thermostat away from direct sunlight or cold drafts, and about 60 inches above the floor.
8 Install electric control box beside boiler and make wire connections between zone valves and thermostats in each zone.
9 Turn on cold-water line and electricity to boiler.