To Next PageTo Next PageWhy is there no hot water from my STIEBEL ELTRON Hydro-Shark SH3-07?
If your STIEBEL ELTRON Boiler isn't producing hot water, the issue might be due to the utility controlling the load, a tripped safety thermal cut-off (which requires a reset), insufficient flow rate because of a wrong-sized pump, or a plugged flow sensor that needs cleaning.
What to do if my STIEBEL ELTRON Boiler's water is not hot enough?
If the water from your STIEBEL ELTRON Boiler isn't hot enough, it could be due to several reasons: * The water flow might be too high, requiring you to reduce it. * The voltage supplied to the unit might be too low, so you need to ensure the correct voltage. * The glycol/water ratio may be off, needing adjustment to be more than 20% less than 50%. * A manifold or ball valve could be closed, requiring you to open the loops/ball valve.
General| Model | SH3-07 |
|---|---|
| Brand | STIEBEL ELTRON |
| Protection Rating | IP24 |
| Type | Electric Tankless Water Heater |
| Power Supply | 220...240 V |
Boilers are exclusively for radiant floor heating applications.
Read manual carefully; improper use voids warranty and risks damage/injury.
Contact technical service line for installation or operation questions.
Boiler electronically controls water temperature between 86-140°F via knob.
Power light indicates full element power or modulation to water temp.
Settings for radiant floor heating in cement/gypcrete and staple up/baseboard.
Install vertically with fittings down; maintain 5" clearance on all sides.
Ensure power is off and remove the cover before mounting.
Mount securely using provided screws and anchors for masonry/wood.
Install vertically with fittings down; maintain 5" clearance on all sides.
Ensure power is off and remove the cover before mounting.
Mount securely using provided screws and anchors for masonry/wood.
Comply with codes; purge system and ensure it's free of debris.
Identify return/supply sides; install P&T relief valve on the supply side.
Use copper/PEX; direct flame away; check for leaks after completion.
Ensure main breaker panel switches are OFF to avoid electric shock.
SH3-07,10,12 use ONE circuit; SH3-14,19,24 use TWO; SH3-29,36 use THREE.
Feed wire through knockouts; connect Live to 'L', Ground to symbol.
Circuits should be equipped with a Ground Fault Interrupter where required.
Details KW, BTU, Volts, Amps, Breaker size, and WT-LBS for models.
Boilers are considered a continuous load; copper conductors only.
Guidance on polarity for multi-circuit models and factory changes.
Possible causes include no power, tripped thermal cut-off, or low flow.
Causes: high flow, low voltage, incorrect glycol ratio, closed valves.
Problem likely with electronic controls; contact Energy Products.
Table listing part numbers for thermal cut-out, flow sensor, control unit, etc.
Three-year warranty against defects; replacement of defective part only.
Owner must secure authorization, show proof of purchase, pay transport costs.
Warranty void if boiler installed/used improperly or design altered.
Wiring diagram for single zone heating with primary/secondary pumps.
Note on boiler elements energized by circulators and available sizes.
Wiring diagram for three zone heating with primary/secondary pumps.
Note on boiler elements energized by circulators and available sizes.
Wiring diagram for four zone heating with primary/secondary pumps.
Note on boiler elements energized by circulators and available sizes.
Wiring diagram for single zone heating with primary/secondary pumps.
Note on boiler elements energized by circulators and available sizes.
Wiring diagram for three zone heating with primary/secondary pumps.
Note on boiler elements energized by circulators and available sizes.
Wiring diagram for four zone heating with primary/secondary pumps.
Note on boiler elements energized by circulators and available sizes.
pH affects system life; maintain between 9 and 10.5 to prevent corrosion.
Low glycol (<20%) promotes bacteria; use dispersants and biocide to remove.
High conductivity (>3500 uS/cm) indicates solids that can damage o-rings.
Softened water leaches minerals; consider dispersants for hard water.
Fill the system until no air bubbles are present to prevent failures.
Purge each loop one at a time until no air is seen in the discharge.
Use polypropylene glycol (20-50%) and city water; avoid RV/automotive antifreeze.
Connect hoses to mixing tub, pump, and primary circulator gate valves.
Circulate fluid until air is removed; bucket must have fluid at all times.
Ball valve 'D' closed during filling; purge valve 'E' vertical for filling.
Procedure for filling using domestic city water supply.
Fill to 15-25 lbs pressure, then turn off fill valve and water.
Water clear, no bubbles, close discharge valve, achieve 15-20 Lbs pressure.
Using Axiom feeders or household auto fill for closed loop systems.
