hotun SF range

hotun SF

Product Overview

Now with 10 Year Warranty!

The hotun SF range of products, combines a tundish and dry-trap to provide a safe and visible discharge from a relief valve direct to a local waste or soil pipe, allowing a flow of water from the discharging T/PRV, whilst eliminating the risk of foul odours from the foul system entering back into the building AND providing regulation required, back-flow contamination & back-siphonage protection to prevent contamination of any wholesome water when connecting to the waste pipe (Category 5 risk water)

In a relief valve discharge application, due to the infrequent nature of the relief valve operating, a wet trap would dry out in time and thereafter allow foul odours back into the building, so is therefore not allowed to be used for PRV discharges.

The hotun 100C dry trap tundish was invented and patented back in 2014/15. It was the very first and original, dry trap tundish to be available specifically for boiler and unvented water heater installations as a one product solution and was the very first dry trap tundish to be accepted for use with many of Britains major and most respected boiler manufacturers, such as Worcester Bosch, Vaillant, Glowworm, Ideal, Baxi, Potterton, Ariston, Intergas etc.

The Speefit range of the hotun tundish now allows a quick and easy way to fit the tundish on the pipe using the well know and trusted John Guest brand of fittings. The collet insert allows for the tundish to be fitted to the D1 pipework in a matter of seconds

- hotun SF, is specifically designed and manufactured to achieve compliance for ALL aspects of the (T)PRV to drain installation, including easy visibility at the point of diagnosis with its open sided construction (a vital consideration for easy maintenance)
- The hotun SF tundish can, if necessary, be easily cleaned whilst in situ, meaning that you do not need to remove it or take it apart for maintenance or cleaning
- The spring and bolt are made from high quality A2 stainless steel meaning they will last for the lifetime of the system
- The valve is made from our own molded high quality drainage specification EPDM rubber, we do not use sheet material meaning we are fully in control of the quality of the material.
- hotun is rated for use up to 120°C so is suitable for use in all applications requiring a temperature rated dry trap tundish
- all of our tundish products now carry a 10 year conditional warranty
- Compatible with hotun detect, in-tundish alarm unit

All hotun dry trap tundishes are specifically designed to achieve full compliance (when installed in accordance with our installation instructions) with Water and Building Regulations.

Please note that, where required, the D2 and connecting soil pipe must be suitably rated for the appropriate temperatures and flow rates expected when the Temperature Relief Valve (TRV) is operating under failure conditions.

hotun SF is WRAS approved –

WRAS Approval Number: 1809329

WRAS approval documents

WRAS certificate SF range 29187

hotun SF white

dry trap tundish

hotun SF black

dry trap tundish

Specifications - Connections, Flow Rate, Applications

Inlet pipe size	15mm (or 1/2″ for imperial applications)
Inlet connection	15mm Inbuilt temperature compliant push-fit connection
Outlet pipe size	22mm Copper or 21.5mm plastic
Outlet connection	22mm Compression nut and olive (supplied)
Rated flow	16LPM
Max flow rate	22LPM (with optimised pipework – 200mm straight pipe before tundish see optimised diagrams below)
Usual applications	Small (<15L capacity) water heaters Boilers with PRV’s only (unless otherwise stated by a boiler manufacturers specification/instructions) HIU’s Overflows from storage water tanks Air conditioning unit drip trays MVHR condensation drip trays

NB

1. All D2 downstream pipework and soil pipes for unvented hot water heaters (with Combined T/PRV’s) must be suitably rated for water discharging at 90-95°C.

2. Appliances with PRV’s only (ie boilers and water heaters of less than 15L capacity) do not need a D2 waste pipe temperature requirement

Typical hotun SF Installation Diagrams

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Optimised flow pipework configuration example diagram

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Technical Drawings

Professional dimensioned technical drawing of hotun SF dry trap tundish

For a printable PDF version, please click on the link below

hotun sf – Technical Drawing – Dimensions – Rev A

hotun hiflo SF white

dry trap tundish

hotun hiflo SF black

dry trap tundish

Specifications - Connections, Flow Rate, Applications

Inlet pipe size	15mm (or 1/2″ for imperial applications)
Inlet connection	15mm Inbuilt temperature compliant push-fit connection
Outlet pipe size	32mm – (1 1/4″ equivalent)
Outlet connection	Suitable for 32mm or 1 1/4″push fit or universal mechanical fittings – see compatible connection diagrams below – (hotun hiflo SF outlet size is not compatible with solvent weld fittings)
Rated flow rate	25LPM
Max flow rate	45LPM (with optimised pipework – 200mm straight pipe before tundish see optimised diagrams below)
Usual applications	Any/all unvented water heaters with combined T/PRV’s up to the rated flow rate. Boilers HIU’s Overflows from water tanks Airconditioning drip trays MVHR condensation drip trays

NB

1. All D2 downstream pipework and soil pipes for unvented hot water heaters (with Combined T/PRV’s) must be suitably rated for water discharging at 90-95°C.

2. Appliances with PRV’s only (ie boilers and water heaters of less than 15L capacity) do not need a D2 waste pipe temperature requirement

Typical Installation Diagrams

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Compatible 1 1/4" Outlet Connections

The 1 1/4″ (32mm) outlet on the hiflo version is compatible with either universal compression or push-fit fittings.

Due to the material used in hotun plastic (acetyl) it will not successfully solvent weld, and due to its size, female solvent weld fittings will be too large for the male spigot.

It must also be noted that many solvent weld pipes are not of a sufficient grade (material) and are therefore not suitable to be used in unvented hot water heater D2 discharges when connected to a TEMPERATURE RELIEF VALVE discharge line*.

*NB – this note about the suitability of pipework materials is only relevant to applications that have a TEMPERATURE RELIEF VALVE operating at temperatures above 90°C over several cycles of flow.

For all applications that have a pressure relief valve only (eg boilers and small unvented water heaters) the issue of temperature and volume of water is not an issue and a much wider range of materials will be suitable for use.

If you are unsure of these requirements please feel free to contact our technical team on our contact us page and we will be able to fully discuss these issues with you.

Optimised flow pipework configuration example diagram

Click on image to enlarge in new page