Leonard (TM-800-LF) Single or Multiple Drench or Combination Emergency Shower Thermostatic Mixing Valve, 20 GPM - TM-800-LF

ANSI Z358.1 requires emergency drench showers and combination shower/eyewash equipment to deliver tepid water — defined as 60°F to 100°F (16°C to 38°C) — for the full 15-minute flushing cycle. The Leonard TM-800-LF is a thermostatic mixing valve sized for a single or multiple drench showers, or combination shower/eyewash installations, factory-set to deliver 85°F (29°C) water at flow rates from 3 to 56 GPM. The valve uses Leonard's DURA-trol® solid bimetal thermostat — a one-piece sensor that responds to inlet temperature and pressure changes without electronics, batteries, or wear-prone moving parts. ASSE 1071 and CSA certified, with low-lead construction (under 0.25% wetted surface).

EyewashDirect ships the TM-800-LF direct from Leonard with manufacturer-direct pricing and same-day quotes from a dedicated project team.

Specifications

• Model: TM-800-LF
• Manufacturer: Leonard Valve Company (Cranston, RI)
• Application: Single or multiple drench shower or combination shower/eyewash thermostatic mixing valve
• Rated flow range: 3 – 56 GPM (11 – 212 l/min) up to 45 PSI system pressure drop
• Maximum flow capacity (per Leonard product page): 64 GPM
• Maximum system pressure drop: 45 PSI (3.1 bar)
• Factory temperature setting: 85°F (29°C), locked
• High-temp limit stop: 90°F (32°C), adjustable
• Cold water bypass on hot failure: minimum 20 GPM (76 l/min) @ 30 PSI (2.1 bar)
• Cold water failure response: Valve closes automatically
• Recommended hot inlet temperature: 140°F (60°C)
• Maximum supply temperature: 180°F (82°C)
• Maximum supply pressure: 125 PSI (8.6 bar)
• Inlets: 1" NPT female, top or bottom
• Outlet: 1¼" NPT female, top
• Body width: 12" (305mm)
• Cabinet dimensions (when ordered with cabinet): 16" × 16" × 8"
• Finish: Rough bronze (standard)
• Thermometer: Color-coded outlet dial thermometer, 0–140°F (-10 to 60°C)
• Inlet checkstops: Union angle checkstops standard
• Wall mounting: Integral wall support bracket
• Compliance: ANSI Z358.1, ASSE 1071, CSA Certified
• Lead content: Certified low-lead (less than 0.25% wetted surface area by weight)
• Country of origin: Made in Cranston, Rhode Island, USA (Buy American Act / Build America Buy America compliant)
• Available options: CP (chrome-plated finish) · IT (inlet thermometers) · TOP (top inlets) · BWE-EXP/BWE-REC (baked white steel cabinet) · STSTL-EXP/STSTL-REC (stainless steel cabinet) · SEMI (semi-recessed frame)

Key Features

DURA-trol® Solid Bimetal Thermostat
The TM-800-LF uses Leonard's signature one-piece bimetal sensor linked directly to the valve porting. Unlike wax or liquid-filled cartridges, DURA-trol cannot be damaged by extreme inlet temperatures or pressure spikes, and there are no diaphragms, springs, or electronics to fail. The sensor responds to changes in supply temperature and pressure within seconds, holding the outlet to the locked 85°F setpoint throughout the 15-minute ANSI flushing cycle.

Locked Temperature Setting + Adjustable Limit Stop
The valve ships locked at 85°F (29°C) — the manufacturer's recommended tepid setpoint for general-purpose drench shower service. A separate adjustable high-temperature limit stop is factory-set at 90°F (32°C) so the valve cannot be accidentally turned to deliver scalding water during testing or commissioning. The limit stop must be reset by the installer if incoming hot water exceeds 135°F.

Internal Cold Water Bypass on Hot Water Failure
If the hot water supply fails, the TM-800-LF's internal bypass automatically delivers a minimum of 20 GPM at 30 PSI of cold water to the connected fixture(s). This keeps the safety equipment functional during a hot-line outage — a critical fail-safe because ANSI Z358.1 requires emergency equipment to remain operational and deliver enough water for a full 15-minute flush. The valve also closes automatically if the cold water supply fails, preventing scalding.

Sized for Single or Multiple Drench Showers
The TM-800-LF is the right-size step up from the TM-600-LF when a single valve needs to feed multiple drench showers, a high-demand combination fixture, or longer pipe runs. With 1" NPT inlets, a 1¼" NPT outlet, and a flow range of 3–56 GPM, it handles the higher pressure drop of multi-fixture installations while still controlling temperature accurately across the full flow range.

Built-In Dial Thermometer for Weekly Testing
ANSI Z358.1 requires weekly activation testing of emergency shower equipment. The TM-800-LF includes a color-coded dial thermometer on the outlet (0–140°F range) so a facility safety officer or maintenance tech can verify delivered water temperature at a glance during the weekly flush — no separate gauge or thermometer required.

Cabinet Options for Recessed or Exposed Installations
The TM-800-LF is available bare or pre-installed in a wall cabinet — baked white enamel or stainless steel, recessed or exposed, with a viewport standard on all cabinet versions for visual inspection without opening. Cabinet versions ship as a complete factory-assembled unit, simplifying installation in finished spaces where the valve needs to be concealed but accessible for service.

Buy American Act + ASSE 1071 + ANSI Z358.1 Compliant
The TM-800-LF carries the certifications most commonly required on commercial, industrial, and federal drench shower submittals: ASSE 1071, CSA listing, ANSI Z358.1 compliance, and certified low-lead under the Safe Drinking Water Act. Manufactured in Cranston, Rhode Island, the TM-800-LF is Buy American Act and Build America Buy America compliant — relevant for federal, state, and infrastructure-funded projects.

Installation Guidance

The TM-800-LF is sized for a single drench shower, multiple drench showers, or a high-flow combination shower/eyewash with a flow demand between 3 and 56 GPM. Do not oversize — Leonard's caution is explicit: thermostatic mixing valves do not deliver accurate temperature control outside their rated flow range. If a single fixture requires less than 51 GPM and you don't need the larger inlet sizing, the TM-600-LF is the more economical choice. For installations exceeding 56 GPM (large multi-shower banks, decontamination installations), step up to the TM-5100-LF.

Hot supply should be delivered at 140°F for proper performance. The valve will accept up to 180°F supply and up to 125 PSI system pressure, but the limit stop must be reset by the installer if incoming hot water exceeds 135°F (the factory test temperature). If the supply piping runs through unconditioned space or long horizontal runs, Leonard recommends recirculating the tempered water back to the source to prevent the line from cooling between activations — consult Leonard's piping diagrams for the recommended configuration.

Mount the valve on the wall using the integral support bracket. Inlets are 1" NPT female and can be configured top or bottom; the outlet is 1¼" NPT female, top. Union angle checkstops on both inlets allow service isolation without disturbing the supply piping. Per ANSI Z358.1, the connected drench shower(s) must be tested weekly and inspected annually — the dial thermometer makes the weekly temperature check a 5-second visual.

Frequently Asked Questions

Does the Leonard TM-800-LF meet ANSI Z358.1?
Yes. The TM-800-LF is ANSI Z358.1 compliant and ASSE 1071 certified for emergency drench shower service. ANSI Z358.1 requires tepid water (60°F–100°F) for the full 15-minute flushing cycle, and the TM-800-LF ships factory-locked at 85°F to support ANSI Z358.1 tepid-water compliance when the shower system is properly installed, supplied, tested, and maintained.

What flow rate does the TM-800-LF support?
The TM-800-LF is rated for 3 to 56 GPM (11 to 212 l/min) of mixed flow at the maximum 45 PSI system pressure drop. This range is sized for a single drench shower, multiple drench showers, or a high-flow combination shower/eyewash. Do not undersize or oversize — Leonard explicitly states the valve will not deliver accurate temperature control outside its rated flow range.

What happens if the hot water supply fails?
The TM-800-LF's internal cold water bypass automatically delivers a minimum of 20 GPM at 30 PSI of cold water to the connected fixtures, keeping the safety equipment operational so the user can still complete a 15-minute flush during a hot supply outage. If the cold water supply fails, the valve closes automatically to prevent scalding.

Is the Leonard TM-800-LF a replacement for the Guardian G3800-LF?
The TM-800-LF is commonly specified as a replacement for the Guardian G3800-LF — both are higher-capacity drench shower mixing valves designed for ANSI Z358.1 tepid water service. Confirm inlet/outlet pipe locations and dimensions against the existing installation before ordering, since stub-outs may differ between brands.

What's the difference between the TM-800-LF and the TM-600-LF?
The TM-800-LF (3–56 GPM, 1" inlets / 1¼" outlet) is sized for higher-flow installations — multiple drench showers, longer pipe runs, or high-demand combination fixtures. The TM-600-LF (3–51 GPM, ¾" inlets / 1" outlet) is the more economical choice for a single drench shower or single combination shower/eyewash.

What size are the TM-800-LF inlets and outlet?
The standard TM-800-LF has 1" NPT female inlets — configurable top or bottom — and a 1¼" NPT female top outlet. Union angle checkstops are included on both inlets for service isolation. The optional CP (chrome-plated) configuration uses the same connection sizes.

Is the TM-800-LF available in a cabinet?
Yes. The TM-800-LF can be ordered with a baked white enamel or stainless steel cabinet (16" × 16" × 8"), in either recessed or exposed configurations, with an optional 4" semi-recessed frame. A viewport is standard on all cabinet versions for visual inspection without opening the door.

Is the TM-800-LF Buy American Act compliant?
Yes. The TM-800-LF is manufactured in Cranston, Rhode Island and is Buy American Act and Build America Buy America compliant — relevant for federal, state, and infrastructure-funded projects. The valve is also certified low-lead under the Safe Drinking Water Act, ASSE 1071 certified, and CSA listed.

Pairs Well With / Related Products

Drench Showers and Combination Shower/Eyewash Units
The TM-800-LF is sized for higher-flow drench shower or multi-fixture installations flowing 3–56 GPM. Browse compatible safety showers from the major manufacturers EyewashDirect carries:

• Bradley drench showers and combination units
• Guardian drench showers and combination units
• Haws drench showers and combination units

Replacement Parts and Repair Kits
Leonard publishes factory-supported repair kits for the TM-800-LF: the Valve Repair Kit (KIT R/50M) and Check Repair Kit (KIT 2/50M). Browse Leonard valves and other tempering valve service parts:

• Leonard valves and replacement parts
• All eyewash and safety shower repair parts

Compare Other Leonard Valves
If your installation is a single eye/face wash only, step down to the TA-300-LF. If your installation is a single drench shower or combination unit (no multi-fixture demand), the TM-600-LF is more economical. For multi-shower banks above 56 GPM, step up to the TM-5100-LF:

• Leonard TA-300-LF — Single Eye/Face Wash TMV, 2–10 GPM (replaces Guardian G3600-LF)
• Leonard TM-600-LF — Single Drench / Combination TMV, 3–51 GPM (replaces Guardian G3700-LF)
• Browse all Leonard tempering valves