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I would be grateful for some advice regarding the installation of a non-return valve (NRV). I have a thermal store (TS) with three coils and which is essentially being used as a buffer tank (boiler is wood pellet fired) in that one coil is used for the boiler flow, the second is used for the...

I have a 25kW wood pellet boiler that provides DHW and runs the C/H system. The C/H system is open vented i.e. has the traditional F&E tank in the attic. A 400 litre thermal store forms part of the C/H system. IMO the system was badly designed in as much as the 400L. thermal store is a waste of...

Despite having excess Fernox in my C/H system and no black sludge visible when I drain off a little water from any radiator, I still get hydrogen* forming which I understand is indicative of corrosion. (*blue flame when lighting the gas during venting of the rad). Would it be of any benefit to...

I have looked at other similar threads which have appeared on this forum but I’m still not sure of the true situation. Also, yes, I have studied Part L1B of the Building Regs but I’m not clear as to whether the exemption I am seeking applies in my case. Can anyone please tell me if I build a...

We intend to build a lean-to conservatory at the rear of our semi-detached house. The neighbour's house has a small extension already so our conservatory will be alongside it. There will be a gap of about 600mm between the two structures. Now currently the flue from our gas combi boiler is about...

I have to make a choice regarding foundations for a conservatory. If I go with a trench foundation I will need 2 cu.m. readymix. Access is very poor, so either a wheelbarrow job (with a heck of a lot of trips) or a pump (£££££’s). If I go with a strip foundation I would need only 0.7 cu.m. –...

The only place I can relocate a vent pipe (leading to the F&E tank) is off a vertical section of 28 mm pipe at the rear of my wood pellet boiler just before the pump in the flow. To do this means inserting a T followed by a swept bend. This will be the only bend in the pipe apart from the one at...

I have read conflicting advice about this on the Internet and would be grateful for a definitive answer regarding the correct layout of pipework to/from an F&E tank. Firstly, please excuse the rather amateurish drawings. The large box at the bottom is the boiler and the circle is the pump...

Can anyone please help me regarding the thickness of underlay relative to the thickness of the gripper rod. I have an 11mm thick underlay which I am putting on top of an aluminium foil faced PE foam which is 5 mm thick - total thickness 16 mm. Obviously this is much thicker than a gripper rod...

I have a problem! We would like to fit (DIY) a conventional lean-to conservatory to our bungalow, outside the existing French doors which lead to the patio. The problem is, is that there is not enough height to the fascia board to give even the minimum fall required. We have looked at all manner...