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Hydronic Accessories

Differential By-pass Valve
Differential By-pass Valves
Noise can be present in a multiple-actuator manifold if only one or two actuators are open. The pump is sized for the total flow rate and highest pressure drop of all the circuits. With just one or two circuits calling for heat, the pump is oversized, possibly causing noise. The Pressure Differential By-pass Valve eliminates water velocity noise and water hammer. With this valve, high-pressure pumps cannot exceed actuator close-off pressure. Pump life increases because of minimal pressure surging as actuators open and close. There is always correct and constant flow regardless of the number of actuators open. The valve adjusts from 2.18 psi (5.0 feet water) to 11.6 psi (26.8 feet water) using a graduated knob. Water by-pass capacity is 0.6 gpm to 9 gpm. Maximum pressure is 145 psi, maximum temperature is 230°F. The knob is set and locked with a set screw to prevent tampering.
Hydronic Flow Guard
Hydronic FlowGuard 1" FPT
FlowGuards are a commercial-quality, non-electronic flow indicator and flow setter. Made of durable, cast brass construction, these units give accurate visual flow indication in GPM. With the ability to set fluid flow, the FlowGuards allow zone-by-zone control and optimization. No special training or electronic instrumentation required.
Hydronic Adjustable Immersion Aquastat
Hydronic Adjustable Immersion Aquastat
The Immersion Aquastat is designed to thread into an immersion well or into a 1/2” FNPT fitting for temperature control of a non-corrosive liquid. Temperature is set by an internal dial from 86° to 212°F (30° to 100°C). The differential is 11°F (6°C). The Immersion Aquastat is non-powered, so external power is not necessary. It features one normally open and one normally closed contact rated at 16 A, 250 V.
Hydronic Air Remover
Hydronic Air Remover
Air Removers are required in any closed-loop hydronic system to remove air from the system and keep it out after the system has been purged. These units automatically remove air (even microbubbles!), as the system circulator operates. All connections are sweat..
Hydronic All Temp Mixing Valves
Hydronic AllTemp Mixing Valves
These simple, durable, non-electric AllTemp Mixing Valves feature a rugged cast-bronze body with liquid-filled copper thermostatic actuators. All connections are FPT threads. These valves are sensitive to the slightest change in mixed water temperature. These valves can be used in both primary/secondary and direct piping applications with at least one pump per valve. These are not to be used for potable water applications as they are not anti-scald valves. For examples of applications, see the HydroControls section.
Hydronic Brass Well Temp Gauge
Hydronic Brass Well for Temperature Gauge
Brass Wells are used with temperature gauges to allow gauge removal or installation without draining the system. Made of solid brass with a 3/4” MNPT to transition to copper and 1/2” FNPT to accept the temperature gauge.
Hydronic Flow Guard
Hydronic FlowGuard 1" MPT
FlowGuards are a commercial-quality, non-electronic flow indicator and flow setter. Made of durable, cast brass construction, these units give accurate visual flow indication in GPM. With the ability to set fluid flow, the FlowGuards allow zone-by-zone control and optimization. No special training or electronic instrumentation required.
Hydronic Mix Temp 180 Valves
Hydronic MixTemp 180 Valves
These durable, non-electric, brass-bodied MixTemp 180 Valves have the widest (100°–180°F) temperature ranges available in a small valve. The valve comes complete with threaded unions for ease of service. All connections are FPT threads. MixTemp valves can be used in both primary/secondary and direct piping applications with at least one pump per valve. These are not to be used for potable water applications as they are not anti-scald valves. For examples of applications, see the HydroControls section.
Hydronic Pressure Gauge
Hydronic Pressure Gauge
These Pressure Gauges are of stainless steel construction with black numbers in psi and kpa on a white dial face covered with a durable lens. Back mounted.
Hydronic Stick Temp
Hydronic StickTemp
These liquid-crystal, digital StickTemp thermometers are an inexpensive, quick way to take temperature readings at various points on a system. Use one at each point a temperature reading is desired. For 3/4” or larger pipe. Peel off the backing paper and apply to any clean surface. Temperature range from 100° to 200°F.
Hydronic Strap-on Aquastats
Hydronic Strap-on Aquastats
These strap-on style Contact Aquastats mount to the outside of any pipe (or circular object) up to 2” diameter by means of an included spring. Both models can be adjusted from “off” to 86° to 194°F (30° to 90°C) and have a differential of 18°F (10°C). The RE model has an external adjustment knob. The RI model has an internal dial, so it can be set and then covered to prevent tampering. Aquastats are non-powered, so no external power is Internal Dial External Dial necessary. They feature one normally open and one normally closed contact rated at 16 A, 250 V.
Hydronic Temperature Gauge
Hydronic Temperature Gauge
These Temperature Gauges are 3” in diameter. They are made with a continuously welded, stainless steel housing with a 2-1/2” long stem and 1/2” NPT threads. The black-on-white dials are marked in °F and °C, and are protected by a rugged crystal lens. Back mounted.
Isotherm
Isotherm
A pre-piped, pre-wired pump and mix valve for 1” Stainless Steel Manifolds
Isotherm Ball Valve
Isotherm Isolation Ball Valve
The IsoTherm is a compact, efficient pre-piped and pre-wired pump and mixing valve control designed to connect to Watts Radiant’s 1” Stainless Steel Manifolds. The IsoTherm is designed to eliminate many jobsite hassles. When combined with Watts Radiant’s electrothermal actuators and actuator valve controls, a complete trouble-free system is created, serving from 1 to 12 zones and delivering up to 50,000 BTU/h (maximum of 68,000 BTU/h with a minimum boiler temperature of 160°F). With a standard temperature range of 113° to 140°F (45° to 60°C), many different installation types can be accommodated. The unit is factory set at 131°F (55°C). The valve is easily adjustable and locks in position with a “click-stop” device, preventing temperature drift. Furthermore, a three-speed 1/25-HP pump comes pre-installed and pre-wired, taking the guesswork out of field installations. This unit is ready — right out of the box!
Pressure Differential By-pass Valve
Pressure Differential By-pass Valve
When just one or two actuators are open, noise from excessive water velocity can result. The Pressure Differential By-pass Valve for 1” Stainless Steel manifolds eliminates possible water velocity noise and water hammer. With this valve, pumps cannot exceed the actuator close-off pressure. Pump life increases because of minimal pressure surging as actuators open and close. Correct and constant flow is always ensured regardless of the number of actuators open. This Pressure Differential By-pass Valve installs directly on the 1” Stainless Steel manifolds using the same quick, durable flat-seal connections and supplied unions. This valve adjusts from 0.7 psi (1.6 feet water) to 10.3 psi (23.8 feet water) using a graduated knob. Water by-pass capacity is 1.2 gpm to 9 gpm. The knob is set and locked with a set screw to prevent tampering.
Vent and Purge Assembly
Vent-and-Purge Assembly
When just one or two actuators are open, noise from excessive water velocity can result. The Pressure Differential By-pass Valve for 1” Stainless Steel manifolds eliminates possible water velocity noise and water hammer. With this valve, pumps cannot exceed the actuator close-off pressure. Pump life increases because of minimal pressure surging as actuators open and close. Correct and constant flow is always ensured regardless of the number of actuators open. This Pressure Differential By-pass Valve installs directly on the 1” Stainless Steel manifolds using the same quick, durable flat-seal connections and supplied unions. This valve adjusts from 0.7 psi (1.6 feet water) to 10.3 psi (23.8 feet water) using a graduated knob. Water by-pass capacity is 1.2 gpm to 9 gpm. The knob is set and locked with a set screw to prevent tampering.
Watts Combination Temp Press Gauge
Watts Combination Temp/Press Gauge
These gauges combine a graduated temperature gauge and pressure gauge in ONE unit! Features metal construction for ruggedness. An ingenious self-sealing 1/2” MPT brass well is included so minimal system fluid is lost if the gauge is ever removed from the system. A manually-adjustable pointer can be used to track temperature or pressure changes. These gauges come in two styles: either bottom mount or back mount for mounting convenience. Install one of these gauges and monitor your system easily, efficiently, and reliably.
Watts Combination Temp Press Gauge Back Mount
Watts Combination Temp/Press Gauge Back Mount
Combination Gauge, 60°–320°F/0–200 PSI These gauges combine a graduated temperature gauge and pressure gauge in ONE unit! Features metal construction for ruggedness. An ingenious self-sealing 1/2” MPT brass well is included so minimal system fluid is lost if the gauge is ever removed from the system. A manually-adjustable pointer can be used to track temperature or pressure changes. These gauges come in two styles: either bottom mount or back mount for mounting convenience. Install one of these gauges and monitor your system easily, efficiently, and reliably.

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